O[U]String::replaceAt overloads that take string_view

which results in lots of nice string_view improvements picked up by the plugins Change-Id: Ib0ec3887816b3d4436d003b739d9814f83e244b2 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/125657 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
author: Noel Grandin <noel.grandin@collabora.co.uk> 2021-11-22 14:08:27 +0200
committer: Noel Grandin <noel.grandin@collabora.co.uk> 2021-11-23 14:00:08 +0100
commit: ec1c4c49301758c54394f9943252e192ad54638b (patch)
tree: b53af3cb9154a388495b1af35c3f8ff41d6ebe1f
parent: db0f2c29bf3a6ad5a08f8524ea0e65aa90792bb2 (diff)
145 files changed, 436 insertions, 279 deletions
diff --git a/basctl/source/basicide/baside2b.cxx b/basctl/source/basicide/baside2b.cxx
index 48f429848f66..9da55fa318a8 100644
--- a/basctl/source/basicide/baside2b.cxx
+++ b/basctl/source/basicide/baside2b.cxx
@@ -175,13 +175,13 @@ void lcl_SeparateNameAndIndex( const OUString& rVName, OUString& rVar, OUString&
     {
         sal_uInt16 nLastChar = rVar.getLength()-1;
         if ( cSuffixes.find(rVar[ nLastChar ] ) != std::u16string_view::npos )
-            rVar = rVar.replaceAt( nLastChar, 1, "" );
+            rVar = rVar.replaceAt( nLastChar, 1, u"" );
     }
     if ( !rIndex.isEmpty() )
     {
         sal_uInt16 nLastChar = rIndex.getLength()-1;
         if ( cSuffixes.find(rIndex[ nLastChar ] ) != std::u16string_view::npos )
-            rIndex = rIndex.replaceAt( nLastChar, 1, "" );
+            rIndex = rIndex.replaceAt( nLastChar, 1, u"" );
     }
 }
 
@@ -373,7 +373,7 @@ void EditorWindow::RequestHelp( const HelpEvent& rHEvt )
                 {
                     sal_uInt16 nLastChar = aWord.getLength() - 1;
                     if ( cSuffixes.find(aWord[ nLastChar ] ) != std::u16string_view::npos )
-                        aWord = aWord.replaceAt( nLastChar, 1, "" );
+                        aWord = aWord.replaceAt( nLastChar, 1, u"" );
                     SbxBase* pSBX = StarBASIC::FindSBXInCurrentScope( aWord );
                     if (SbxVariable const* pVar = IsSbxVariable(pSBX))
                     {
diff --git a/basic/source/runtime/runtime.cxx b/basic/source/runtime/runtime.cxx
index 00c90e30379d..bad307f27dd6 100644
--- a/basic/source/runtime/runtime.cxx
+++ b/basic/source/runtime/runtime.cxx
@@ -2853,7 +2853,7 @@ void SbiRuntime::StepLOADNC( sal_uInt32 nOp1 )
     sal_Int32 iComma = aStr.indexOf(',');
     if( iComma >= 0 )
     {
-        aStr = aStr.replaceAt(iComma, 1, ".");
+        aStr = aStr.replaceAt(iComma, 1, u".");
     }
     sal_Int32 nParseEnd = 0;
     rtl_math_ConversionStatus eStatus = rtl_math_ConversionStatus_Ok;
diff --git a/chart2/source/inc/CommonConverters.hxx b/chart2/source/inc/CommonConverters.hxx
index e8daa87d5c95..18adcebf7187 100644
--- a/chart2/source/inc/CommonConverters.hxx
+++ b/chart2/source/inc/CommonConverters.hxx
@@ -206,7 +206,7 @@ sal_Int16 getShortForLongAlso( const css::uno::Any& rAny );
 OOO_DLLPUBLIC_CHARTTOOLS
 bool replaceParamterInString( OUString & rInOutResourceString,
                             const OUString & rParamToReplace,
-                            const OUString & rReplaceWith );
+                            std::u16string_view rReplaceWith );
 
 } //namespace chart
 
diff --git a/chart2/source/tools/CommonConverters.cxx b/chart2/source/tools/CommonConverters.cxx
index b4b4cbf62e72..2695d2da3418 100644
--- a/chart2/source/tools/CommonConverters.cxx
+++ b/chart2/source/tools/CommonConverters.cxx
@@ -519,7 +519,7 @@ sal_Int16 getShortForLongAlso( const uno::Any& rAny )
 
 bool replaceParamterInString( OUString & rInOutResourceString,
                             const OUString & rParamToReplace,
-                            const OUString & rReplaceWith )
+                            std::u16string_view rReplaceWith )
 {
     sal_Int32 nPos = rInOutResourceString.indexOf( rParamToReplace );
     if( nPos == -1 )
diff --git a/comphelper/source/misc/logging.cxx b/comphelper/source/misc/logging.cxx
index 405a4acaeb68..b656389def83 100644
--- a/comphelper/source/misc/logging.cxx
+++ b/comphelper/source/misc/logging.cxx
@@ -94,7 +94,7 @@ namespace comphelper
 
     namespace
     {
-        void lcl_replaceParameter( OUString& _inout_Message, const char* _rPlaceHolder, const OUString& _rReplacement )
+        void lcl_replaceParameter( OUString& _inout_Message, const char* _rPlaceHolder, std::u16string_view _rReplacement )
         {
             sal_Int32 nPlaceholderPosition = _inout_Message.indexOfAsciiL( _rPlaceHolder, strlen(_rPlaceHolder) );
             OSL_ENSURE( nPlaceholderPosition >= 0, "lcl_replaceParameter: placeholder not found!" );
diff --git a/comphelper/source/misc/string.cxx b/comphelper/source/misc/string.cxx
index e1217dc5560f..a3ee9bc58521 100644
--- a/comphelper/source/misc/string.cxx
+++ b/comphelper/source/misc/string.cxx
@@ -465,7 +465,7 @@ OUString removeAny(std::u16string_view rIn,
 }
 
 OUString setToken(const OUString& rIn, sal_Int32 nToken, sal_Unicode cTok,
-    const OUString& rNewToken)
+    std::u16string_view rNewToken)
 {
     sal_Int32 nLen = rIn.getLength();
     sal_Int32 nTok = 0;
diff --git a/connectivity/source/commontools/DateConversion.cxx b/connectivity/source/commontools/DateConversion.cxx
index 81338b3dc9fa..38f20af0926c 100644
--- a/connectivity/source/commontools/DateConversion.cxx
+++ b/connectivity/source/commontools/DateConversion.cxx
@@ -90,7 +90,7 @@ OUString DBTypeConversion::toSQLString(sal_Int32 eType, const Any& _rVal,
                             nIndex += 2;
                             nIndex = aTemp.indexOf(sQuot,nIndex);
                             if(nIndex != -1)
-                                aTemp = aTemp.replaceAt(nIndex,sQuot.getLength(), "\'\'");
+                                aTemp = aTemp.replaceAt(nIndex,sQuot.getLength(), u"\'\'");
                         } while (nIndex != -1);
 
                         aRet.append(aTemp);
diff --git a/connectivity/source/commontools/dbtools2.cxx b/connectivity/source/commontools/dbtools2.cxx
index 0adfe23bdac9..5f07a272cec2 100644
--- a/connectivity/source/commontools/dbtools2.cxx
+++ b/connectivity/source/commontools/dbtools2.cxx
@@ -122,7 +122,7 @@ OUString createStandardTypePart(const Reference< XPropertySet >& xColProp,const
     {
         sal_Int32 nIndex = sTypeName.indexOf(sAutoIncrementValue);
         if (nIndex != -1)
-            sTypeName = sTypeName.replaceAt(nIndex,sTypeName.getLength() - nIndex,OUString());
+            sTypeName = sTypeName.replaceAt(nIndex,sTypeName.getLength() - nIndex, u"");
     }
 
     if ( (nPrecision > 0 || nScale > 0) && bUseLiteral )
@@ -387,7 +387,7 @@ OUString createSqlCreateTableStatement(  const Reference< XPropertySet >& descri
     else
     {
         if ( aSql.endsWith(",") )
-            aSql = aSql.replaceAt(aSql.getLength()-1, 1, ")");
+            aSql = aSql.replaceAt(aSql.getLength()-1, 1, u")");
         else
             aSql += ")";
     }
diff --git a/connectivity/source/commontools/predicateinput.cxx b/connectivity/source/commontools/predicateinput.cxx
index 37a0d6862c62..047f9ccc7c94 100644
--- a/connectivity/source/commontools/predicateinput.cxx
+++ b/connectivity/source/commontools/predicateinput.cxx
@@ -153,7 +153,7 @@ namespace dbtools
                     sal_Int32 nTemp = 0;
                     while ( -1 != ( nIndex = sQuoted.indexOf( '\'',nTemp ) ) )
                     {
-                        sQuoted = sQuoted.replaceAt( nIndex, 1, "''" );
+                        sQuoted = sQuoted.replaceAt( nIndex, 1, u"''" );
                         nTemp = nIndex+2;
                     }
 
diff --git a/connectivity/source/drivers/dbase/DTable.cxx b/connectivity/source/drivers/dbase/DTable.cxx
index 90d0b9f21759..c5da1d6b2477 100644
--- a/connectivity/source/drivers/dbase/DTable.cxx
+++ b/connectivity/source/drivers/dbase/DTable.cxx
@@ -646,7 +646,7 @@ OUString ODbaseTable::getEntry(file::OConnection const * _pConnection, std::u16s
             // name and extension have to coincide
             if ( _pConnection->matchesExtension( sExt ) )
             {
-                sName = sName.replaceAt(sName.getLength() - (sExt.getLength() + 1), sExt.getLength() + 1, OUString());
+                sName = sName.replaceAt(sName.getLength() - (sExt.getLength() + 1), sExt.getLength() + 1, u"");
                 if ( sName == _sName )
                 {
                     Reference< XContentAccess > xContentAccess( xDir, UNO_QUERY );
diff --git a/connectivity/source/drivers/firebird/Tables.cxx b/connectivity/source/drivers/firebird/Tables.cxx
index 215ffe61bdf9..ebd6f2309cc8 100644
--- a/connectivity/source/drivers/firebird/Tables.cxx
+++ b/connectivity/source/drivers/firebird/Tables.cxx
@@ -178,7 +178,7 @@ ObjectType Tables::appendObject(const OUString& rName,
     else
     {
         if ( sSql.endsWith(",") )
-            sSql = sSql.replaceAt(sSql.getLength()-1, 1, ")");
+            sSql = sSql.replaceAt(sSql.getLength()-1, 1, u")");
         else
             sSql += ")";
     }
diff --git a/connectivity/source/drivers/firebird/Util.cxx b/connectivity/source/drivers/firebird/Util.cxx
index 6cc70b4270f4..2d694eac94ec 100644
--- a/connectivity/source/drivers/firebird/Util.cxx
+++ b/connectivity/source/drivers/firebird/Util.cxx
@@ -417,7 +417,7 @@ OUString firebird::escapeWith( const OUString& sText, const char aKey, const cha
         aIndex = sRet.indexOf(aKey, aIndex);
         if ( aIndex <= 0 || aIndex >= sRet.getLength())
             break;
-        sRet = sRet.replaceAt(aIndex, 1, OUStringChar(aEscapeChar) + OUStringChar(aKey)  );
+        sRet = sRet.replaceAt(aIndex, 1, rtl::OUStringConcatenation(OUStringChar(aEscapeChar) + OUStringChar(aKey))  );
         aIndex += 2;
     }
 
diff --git a/connectivity/source/drivers/flat/ETable.cxx b/connectivity/source/drivers/flat/ETable.cxx
index 7c47240c27c4..68f1a82dcdd7 100644
--- a/connectivity/source/drivers/flat/ETable.cxx
+++ b/connectivity/source/drivers/flat/ETable.cxx
@@ -472,7 +472,7 @@ OUString OFlatTable::getEntry() const
             if ( m_pConnection->matchesExtension( sExt ) )
             {
                 if ( !sExt.isEmpty() )
-                    sName = sName.replaceAt(sName.getLength() - (sExt.getLength() + 1), sExt.getLength()+1, OUString());
+                    sName = sName.replaceAt(sName.getLength() - (sExt.getLength() + 1), sExt.getLength()+1, u"");
                 if ( sName == m_Name )
                 {
                     Reference< XContentAccess > xContentAccess( xDir, UNO_QUERY );
diff --git a/connectivity/source/drivers/hsqldb/HTable.cxx b/connectivity/source/drivers/hsqldb/HTable.cxx
index a60898eb44f4..9a23b6052468 100644
--- a/connectivity/source/drivers/hsqldb/HTable.cxx
+++ b/connectivity/source/drivers/hsqldb/HTable.cxx
@@ -301,7 +301,7 @@ void OHSQLTable::executeStatement(const OUString& _rStatement )
 {
     OUString sSQL = _rStatement;
     if(sSQL.endsWith(","))
-        sSQL = sSQL.replaceAt(sSQL.getLength()-1, 1, ")");
+        sSQL = sSQL.replaceAt(sSQL.getLength()-1, 1, u")");
 
     Reference< XStatement > xStmt = getConnection()->createStatement(  );
     if ( xStmt.is() )
diff --git a/connectivity/source/drivers/mysql_jdbc/YTable.cxx b/connectivity/source/drivers/mysql_jdbc/YTable.cxx
index 54b8915cab63..b5b02fefc1bc 100644
--- a/connectivity/source/drivers/mysql_jdbc/YTable.cxx
+++ b/connectivity/source/drivers/mysql_jdbc/YTable.cxx
@@ -312,7 +312,7 @@ void OMySQLTable::executeStatement(const OUString& _rStatement)
 {
     OUString sSQL = _rStatement;
     if (sSQL.endsWith(","))
-        sSQL = sSQL.replaceAt(sSQL.getLength() - 1, 1, ")");
+        sSQL = sSQL.replaceAt(sSQL.getLength() - 1, 1, u")");
 
     Reference<XStatement> xStmt = getConnection()->createStatement();
     if (xStmt.is())
diff --git a/connectivity/source/drivers/mysql_jdbc/YTables.cxx b/connectivity/source/drivers/mysql_jdbc/YTables.cxx
index be962d3d7c33..9d598892d32b 100644
--- a/connectivity/source/drivers/mysql_jdbc/YTables.cxx
+++ b/connectivity/source/drivers/mysql_jdbc/YTables.cxx
@@ -153,7 +153,7 @@ OUString OTables::adjustSQL(const OUString& _sSql)
         sal_Int32 nPos = nIndex + strlen(s_sUNSIGNED);
         OUString sNewUnsigned(sSQL.copy(nPos, nParen - nPos + 1));
         sSQL = sSQL.replaceAt(nIndex, strlen(s_sUNSIGNED) + sNewUnsigned.getLength(),
-                              sNewUnsigned + s_sUNSIGNED);
+                              rtl::OUStringConcatenation(sNewUnsigned + s_sUNSIGNED));
         nIndex = sSQL.indexOf(s_sUNSIGNED, nIndex + strlen(s_sUNSIGNED) + sNewUnsigned.getLength());
     }
     return sSQL;
diff --git a/connectivity/source/parse/sqlnode.cxx b/connectivity/source/parse/sqlnode.cxx
index 48c55051ef6b..02056253c300 100644
--- a/connectivity/source/parse/sqlnode.cxx
+++ b/connectivity/source/parse/sqlnode.cxx
@@ -106,7 +106,7 @@ namespace
         @return
             The quoted string.
     */
-    OUString SetQuotation(std::u16string_view rValue, const OUString& rQuot, const OUString& rQuotToReplace)
+    OUString SetQuotation(std::u16string_view rValue, const OUString& rQuot, std::u16string_view rQuotToReplace)
     {
         OUString rNewValue = rQuot + rValue;
         sal_Int32 nIndex = sal_Int32(-1);   // Replace quotes with double quotes or the parser gets into problems
@@ -757,7 +757,7 @@ void OSQLParseNode::impl_parseLikeNodeToString_throw( OUStringBuffer& rString, c
     {
         OUString aStr = ConvertLikeToken(pParaNode, pEscNode, rParam.bInternational);
         rString.append(" ");
-        rString.append(SetQuotation(aStr,"\'","\'\'"));
+        rString.append(SetQuotation(aStr, "\'", u"\'\'"));
     }
     else
         pParaNode->impl_parseNodeToString_throw( rString, aNewParam, false );
@@ -1140,7 +1140,7 @@ OUString OSQLParser::stringToDouble(const OUString& _rValue,sal_Int16 _nScale)
                 aValue = OUString::number(aResult.Value);
                 sal_Int32 nPos = aValue.lastIndexOf('.');
                 if((nPos+_nScale) < aValue.getLength())
-                    aValue = aValue.replaceAt(nPos+_nScale,aValue.getLength()-nPos-_nScale,OUString());
+                    aValue = aValue.replaceAt(nPos+_nScale,aValue.getLength()-nPos-_nScale, u"");
                 aValue = aValue.replaceAt(aValue.lastIndexOf('.'),1,s_xLocaleData->getLocaleItem(m_pData->aLocale).decimalSeparator);
                 return aValue;
             }
@@ -2429,7 +2429,7 @@ void OSQLParseNode::parseLeaf(OUStringBuffer& rString, const SQLParseNodeParamet
         case SQLNodeType::String:
             if (!rString.isEmpty())
                 rString.append(" ");
-            rString.append(SetQuotation(m_aNodeValue,"\'","\'\'"));
+            rString.append(SetQuotation(m_aNodeValue, "\'", u"\'\'"));
             break;
         case SQLNodeType::Name:
             if (!rString.isEmpty())
diff --git a/connectivity/source/resource/sharedresources.cxx b/connectivity/source/resource/sharedresources.cxx
index a6f218147e71..0f8bccefd96b 100644
--- a/connectivity/source/resource/sharedresources.cxx
+++ b/connectivity/source/resource/sharedresources.cxx
@@ -101,7 +101,7 @@ namespace connectivity
     namespace
     {
         size_t lcl_substitute( OUString& _inout_rString,
-            const char* _pAsciiPattern, const OUString& _rReplace )
+            const char* _pAsciiPattern, std::u16string_view _rReplace )
         {
             size_t nOccurrences = 0;
 
diff --git a/cui/source/customize/cfg.cxx b/cui/source/customize/cfg.cxx
index 79961fe690c2..526aa4e9c411 100644
--- a/cui/source/customize/cfg.cxx
+++ b/cui/source/customize/cfg.cxx
@@ -2990,7 +2990,7 @@ bool SvxIconSelectorDialog::ReplaceGraphicItem(
 
 namespace
 {
-    OUString ReplaceIconName(const OUString& rMessage)
+    OUString ReplaceIconName(std::u16string_view rMessage)
     {
         OUString name;
         OUString message = CuiResId( RID_SVXSTR_REPLACE_ICON_WARNING );
@@ -3009,7 +3009,7 @@ namespace
     private:
         std::unique_ptr<weld::MessageDialog> m_xQueryBox;
     public:
-        SvxIconReplacementDialog(weld::Window *pParent, const OUString& rMessage, bool bYestoAll)
+        SvxIconReplacementDialog(weld::Window *pParent, std::u16string_view rMessage, bool bYestoAll)
             : m_xQueryBox(Application::CreateMessageDialog(pParent, VclMessageType::Warning, VclButtonsType::NONE, ReplaceIconName(rMessage)))
         {
             m_xQueryBox->set_title(CuiResId(RID_SVXSTR_REPLACE_ICON_CONFIRM));
diff --git a/cui/source/dialogs/about.cxx b/cui/source/dialogs/about.cxx
index 36a7e6e69656..7216ca55e3b8 100644
--- a/cui/source/dialogs/about.cxx
+++ b/cui/source/dialogs/about.cxx
@@ -76,7 +76,7 @@ AboutDialog::AboutDialog(weld::Window *pParent)
     m_pBuildLabel->set_uri("https://gerrit.libreoffice.org/gitweb?p=core.git;a=log;h="
                            + sbuildId);
     m_pBuildLabel->set_label(sbuildId.getLength() > nMaxChar ? sbuildId.replaceAt(
-                                 nMaxChar, sbuildId.getLength() - nMaxChar, "...")
+                                 nMaxChar, sbuildId.getLength() - nMaxChar, u"...")
                                                              : sbuildId);
   } else {
     m_pBuildCaption->hide();
diff --git a/cui/source/dialogs/hyphen.cxx b/cui/source/dialogs/hyphen.cxx
index a16dca1e20a3..0535902d4447 100644
--- a/cui/source/dialogs/hyphen.cxx
+++ b/cui/source/dialogs/hyphen.cxx
@@ -263,7 +263,7 @@ bool SvxHyphenWordDialog::SelLeft()
             DBG_ASSERT(i <= aTxt.getLength(), "index out of range");
             if (aTxt[ i ] == sal_Unicode( HYPH_POS_CHAR ))
             {
-                aTxt = aTxt.replaceAt( i, 1, OUString( CUR_HYPH_POS_CHAR ) );
+                aTxt = aTxt.replaceAt( i, 1, rtl::OUStringChar( CUR_HYPH_POS_CHAR ) );
 
                 m_nOldPos = i;
                 m_xWordEdit->set_text(aTxt);
@@ -286,7 +286,7 @@ bool SvxHyphenWordDialog::SelRight()
     {
         if (aTxt[ i ] == sal_Unicode( HYPH_POS_CHAR ))
         {
-            aTxt = aTxt.replaceAt( i, 1, OUString( CUR_HYPH_POS_CHAR ) );
+            aTxt = aTxt.replaceAt( i, 1, rtl::OUStringChar( CUR_HYPH_POS_CHAR ) );
 
             m_nOldPos = i;
             m_xWordEdit->set_text(aTxt);
diff --git a/cui/source/dialogs/scriptdlg.cxx b/cui/source/dialogs/scriptdlg.cxx
index 3bc7a52b40ab..acbdad7a1b16 100644
--- a/cui/source/dialogs/scriptdlg.cxx
+++ b/cui/source/dialogs/scriptdlg.cxx
@@ -1091,11 +1091,11 @@ namespace {
 OUString ReplaceString(
     const OUString& source,
     const OUString& token,
-    const OUString& value )
+    std::u16string_view value )
 {
     sal_Int32 pos = source.indexOf( token );
 
-    if ( pos != -1 && !value.isEmpty() )
+    if ( pos != -1 && !value.empty() )
     {
         return source.replaceAt( pos, token.getLength(), value );
     }
@@ -1107,9 +1107,9 @@ OUString ReplaceString(
 
 OUString FormatErrorString(
     const OUString& unformatted,
-    const OUString& language,
-    const OUString& script,
-    const OUString& line,
+    std::u16string_view language,
+    std::u16string_view script,
+    std::u16string_view line,
     std::u16string_view type,
     std::u16string_view message )
 {
@@ -1247,7 +1247,7 @@ OUString GetErrorMessage(
         message = sError.Message;
     }
     return FormatErrorString(
-        unformatted, language, script, OUString(), std::u16string_view(), message );
+        unformatted, language, script, u"", std::u16string_view(), message );
 }
 
 OUString GetErrorMessage( const css::uno::Any& aException )
diff --git a/cui/source/tabpages/numfmt.cxx b/cui/source/tabpages/numfmt.cxx
index 3058847d3c8a..219972d75edc 100644
--- a/cui/source/tabpages/numfmt.cxx
+++ b/cui/source/tabpages/numfmt.cxx
@@ -103,12 +103,12 @@ void SvxNumberPreview::NotifyChange( const OUString& rPrevStr,
         {
             mnChar = aPrevStr[ mnPos + 1 ];
             // delete placeholder and char to repeat
-            aPrevStr = aPrevStr.replaceAt( mnPos, 2, "" );
+            aPrevStr = aPrevStr.replaceAt( mnPos, 2, u"" );
         }
         else
         {
             // delete placeholder
-            aPrevStr = aPrevStr.replaceAt( mnPos, 1, "" );
+            aPrevStr = aPrevStr.replaceAt( mnPos, 1, u"" );
             // do not attempt to draw a 0 fill character
             mnPos = -1;
         }
@@ -158,7 +158,7 @@ void SvxNumberPreview::Paint(vcl::RenderContext& rRenderContext, const ::tools::
         if (nNumCharsToInsert > 0)
         {
             for (int i = 0; i < nNumCharsToInsert; ++i)
-                aTmpStr = aTmpStr.replaceAt(mnPos, 0, OUString(mnChar));
+                aTmpStr = aTmpStr.replaceAt(mnPos, 0, rtl::OUStringChar(mnChar));
         }
     }
 
diff --git a/dbaccess/source/filter/hsqldb/utils.cxx b/dbaccess/source/filter/hsqldb/utils.cxx
index 041df17a700a..10e07cf3ba30 100644
--- a/dbaccess/source/filter/hsqldb/utils.cxx
+++ b/dbaccess/source/filter/hsqldb/utils.cxx
@@ -79,7 +79,7 @@ OUString utils::convertToUTF8(std::string_view original)
             if (escape)
             {
                 i -= 2;
-                res = res.replaceAt(i, 6, OUString(c));
+                res = res.replaceAt(i, 6, rtl::OUStringChar(c));
                 ++i;
             }
         }
diff --git a/dbaccess/source/ui/dlg/dbwizsetup.cxx b/dbaccess/source/ui/dlg/dbwizsetup.cxx
index c04218620e9c..5a67b9166185 100644
--- a/dbaccess/source/ui/dlg/dbwizsetup.cxx
+++ b/dbaccess/source/ui/dlg/dbwizsetup.cxx
@@ -778,7 +778,7 @@ bool ODbTypeWizDialogSetup::SaveDatabaseDocument()
         {
             OUString sDefaultName = DBA_RES( STR_DATABASEDEFAULTNAME );
             OUString sExtension = pFilter->GetDefaultExtension();
-            sDefaultName += sExtension.replaceAt( 0, 1, OUString() );
+            sDefaultName += sExtension.replaceAt( 0, 1, u"" );
             INetURLObject aWorkURL( m_sWorkPath );
             aWorkURL.Append( sDefaultName );
             sDefaultName = createUniqueFileName( aWorkURL );
diff --git a/dbaccess/source/ui/querydesign/QueryDesignView.cxx b/dbaccess/source/ui/querydesign/QueryDesignView.cxx
index 1d0664305452..4ea3681e26cd 100644
--- a/dbaccess/source/ui/querydesign/QueryDesignView.cxx
+++ b/dbaccess/source/ui/querydesign/QueryDesignView.cxx
@@ -326,7 +326,7 @@ namespace
         if(_rJoin.endsWith(")"))
         {
             bBrace = true;
-            _rJoin = _rJoin.replaceAt(_rJoin.getLength()-1,1,OUString(' '));
+            _rJoin = _rJoin.replaceAt(_rJoin.getLength()-1,1, u" ");
         }
         _rJoin += C_AND + BuildJoinCriteria(_xConnection,&pData->GetConnLineDataList(),pData);
         if(bBrace)
@@ -1082,7 +1082,7 @@ namespace
         }
 
         if(!aTableListStr.isEmpty())
-            aTableListStr = aTableListStr.replaceAt(aTableListStr.getLength()-1,1, OUString() );
+            aTableListStr = aTableListStr.replaceAt(aTableListStr.getLength()-1,1, u"" );
         return aTableListStr;
     }
     OUString GenerateGroupBy(const OQueryDesignView* _pView,OTableFields& _rFieldList, bool bMulti )
@@ -1140,7 +1140,7 @@ namespace
             }
             if ( !aGroupByStr.isEmpty() )
             {
-                aGroupByStr = aGroupByStr.replaceAt(aGroupByStr.getLength()-1,1, OUString(' ') );
+                aGroupByStr = aGroupByStr.replaceAt(aGroupByStr.getLength()-1,1, u" " );
                 OUString aGroupByStr2 = " GROUP BY " + aGroupByStr;
                 aGroupByStr = aGroupByStr2;
             }
diff --git a/editeng/inc/editdoc.hxx b/editeng/inc/editdoc.hxx
index 4fdff5b2a378..4d4de9497b67 100644
--- a/editeng/inc/editdoc.hxx
+++ b/editeng/inc/editdoc.hxx
@@ -287,7 +287,7 @@ public:
     void      UnExpandPositions( sal_Int32 &rStartPos, sal_Int32 &rEndPos );
 
     void SetChar(sal_Int32 nPos, sal_Unicode c);
-    void Insert(const OUString& rStr, sal_Int32 nPos);
+    void Insert(std::u16string_view rStr, sal_Int32 nPos);
     void Append(std::u16string_view rStr);
     void Erase(sal_Int32 nPos);
     void Erase(sal_Int32 nPos, sal_Int32 nCount);
diff --git a/editeng/qa/unit/core-test.cxx b/editeng/qa/unit/core-test.cxx
index 740f58f0b772..8215c451118a 100644
--- a/editeng/qa/unit/core-test.cxx
+++ b/editeng/qa/unit/core-test.cxx
@@ -371,7 +371,7 @@ private:
     virtual bool Delete( sal_Int32 nStt, sal_Int32 nEnd ) override
     {
         //fprintf(stderr, "TestAutoCorrDoc::Delete\n");
-        m_rText = m_rText.replaceAt(nStt, nEnd-nStt, "");
+        m_rText = m_rText.replaceAt(nStt, nEnd-nStt, u"");
         return true;
     }
     virtual bool Insert( sal_Int32 nPos, const OUString& rTxt ) override
diff --git a/editeng/source/editeng/editdoc.cxx b/editeng/source/editeng/editdoc.cxx
index f2fef724e696..36a7d5727434 100644
--- a/editeng/source/editeng/editdoc.cxx
+++ b/editeng/source/editeng/editdoc.cxx
@@ -1697,10 +1697,10 @@ void ContentNode::UnExpandPositions( sal_Int32 &rStartPos, sal_Int32 &rEndPos )
 
 void ContentNode::SetChar(sal_Int32 nPos, sal_Unicode c)
 {
-    maString = maString.replaceAt(nPos, 1, OUString(c));
+    maString = maString.replaceAt(nPos, 1, rtl::OUStringChar(c));
 }
 
-void ContentNode::Insert(const OUString& rStr, sal_Int32 nPos)
+void ContentNode::Insert(std::u16string_view rStr, sal_Int32 nPos)
 {
     maString = maString.replaceAt(nPos, 0, rStr);
 }
@@ -1717,7 +1717,7 @@ void ContentNode::Erase(sal_Int32 nPos)
 
 void ContentNode::Erase(sal_Int32 nPos, sal_Int32 nCount)
 {
-    maString = maString.replaceAt(nPos, nCount, "");
+    maString = maString.replaceAt(nPos, nCount, u"");
 }
 
 OUString ContentNode::Copy(sal_Int32 nPos) const
@@ -2291,7 +2291,7 @@ EditPaM EditDoc::InsertFeature( EditPaM aPaM, const SfxPoolItem& rItem  )
 {
     assert(aPaM.GetNode());
 
-    aPaM.GetNode()->Insert( OUString(CH_FEATURE), aPaM.GetIndex() );
+    aPaM.GetNode()->Insert( rtl::OUStringChar(CH_FEATURE), aPaM.GetIndex() );
     aPaM.GetNode()->ExpandAttribs( aPaM.GetIndex(), 1, GetItemPool() );
 
     // Create a feature-attribute for the feature...
diff --git a/editeng/source/editeng/eehtml.cxx b/editeng/source/editeng/eehtml.cxx
index d83b5410d14f..a3de37005ffc 100644
--- a/editeng/source/editeng/eehtml.cxx
+++ b/editeng/source/editeng/eehtml.cxx
@@ -195,7 +195,7 @@ void EditHTMLParser::NextToken( HtmlTokenId nToken )
                     sal_Int32 nTabPos = aText.indexOf( '\t');
                     while ( nTabPos != -1 )
                     {
-                        aText = aText.replaceAt( nTabPos, 1, "        " );
+                        aText = aText.replaceAt( nTabPos, 1, u"        " );
                         nTabPos = aText.indexOf( '\t', nTabPos+8 );
                     }
                 }
diff --git a/editeng/source/editeng/impedit2.cxx b/editeng/source/editeng/impedit2.cxx
index 3eacc677e00a..47672cb090f3 100644
--- a/editeng/source/editeng/impedit2.cxx
+++ b/editeng/source/editeng/impedit2.cxx
@@ -1659,7 +1659,7 @@ void ImpEditEngine::InitScriptTypes( sal_Int32 nPara )
         const OUString aFldText = static_cast<const EditCharAttribField*>(pField)->GetFieldValue();
         if ( !aFldText.isEmpty() )
         {
-            aText = aText.replaceAt( pField->GetStart(), 1, aFldText.copy(0,1) );
+            aText = aText.replaceAt( pField->GetStart(), 1, aFldText.subView(0,1) );
             short nFldScriptType = _xBI->getScriptType( aFldText, 0 );
 
             for ( sal_Int32 nCharInField = 1; nCharInField < aFldText.getLength(); nCharInField++ )
@@ -1670,14 +1670,14 @@ void ImpEditEngine::InitScriptTypes( sal_Int32 nPara )
                 if ( nFldScriptType == i18n::ScriptType::WEAK )
                 {
                     nFldScriptType = nTmpType;
-                    aText = aText.replaceAt( pField->GetStart(), 1, aFldText.copy(nCharInField,1) );
+                    aText = aText.replaceAt( pField->GetStart(), 1, aFldText.subView(nCharInField,1) );
                 }
 
                 // ...  but if the first one is LATIN, and there are CJK or CTL chars too,
                 // we prefer that ScriptType because we need another font.
                 if ( ( nTmpType == i18n::ScriptType::ASIAN ) || ( nTmpType == i18n::ScriptType::COMPLEX ) )
                 {
-                    aText = aText.replaceAt( pField->GetStart(), 1, aFldText.copy(nCharInField,1) );
+                    aText = aText.replaceAt( pField->GetStart(), 1, aFldText.subView(nCharInField,1) );
                     break;
                 }
             }
diff --git a/extensions/source/abpilot/abpfinalpage.cxx b/extensions/source/abpilot/abpfinalpage.cxx
index 028a08413bb0..6469691b1f99 100644
--- a/extensions/source/abpilot/abpfinalpage.cxx
+++ b/extensions/source/abpilot/abpfinalpage.cxx
@@ -113,7 +113,7 @@ namespace abp
         sal_Int32 nPos = sName.indexOf(aURL.GetFileExtension());
         if ( nPos != -1 )
         {
-            sName = sName.replaceAt(nPos-1, 4, "");
+            sName = sName.replaceAt(nPos-1, 4, u"");
         }
         m_xName->set_text(sName);
 
diff --git a/forms/source/component/Edit.cxx b/forms/source/component/Edit.cxx
index f82a8479e4bd..32d90aa7d87c 100644
--- a/forms/source/component/Edit.cxx
+++ b/forms/source/component/Edit.cxx
@@ -680,7 +680,7 @@ Any OEditModel::translateDbColumnToControlValue()
             if ( nMaxTextLen && sValue.getLength() > nMaxTextLen )
             {
                 sal_Int32 nDiff = sValue.getLength() - nMaxTextLen;
-                sValue = sValue.replaceAt( nMaxTextLen, nDiff, OUString() );
+                sValue = sValue.replaceAt( nMaxTextLen, nDiff, u"" );
             }
 
             aRet <<= sValue;
diff --git a/formula/source/core/api/FormulaCompiler.cxx b/formula/source/core/api/FormulaCompiler.cxx
index af9d19f68191..9d84909c71c2 100644
--- a/formula/source/core/api/FormulaCompiler.cxx
+++ b/formula/source/core/api/FormulaCompiler.cxx
@@ -2633,7 +2633,7 @@ OpCode FormulaCompiler::NextToken()
                                 if ( c == mxSymbols->getSymbolChar( ocEqual) )
                                 {   // >= instead of =>
                                     aCorrectedFormula = aCorrectedFormula.replaceAt( nPos, 1,
-                                        OUString( mxSymbols->getSymbolChar(ocGreater) ) );
+                                        rtl::OUStringChar( mxSymbols->getSymbolChar(ocGreater) ) );
                                     aCorrectedSymbol = OUString(c);
                                     bCorrected = true;
                                 }
@@ -2642,14 +2642,14 @@ OpCode FormulaCompiler::NextToken()
                                 if ( c == mxSymbols->getSymbolChar( ocEqual) )
                                 {   // <= instead of =<
                                     aCorrectedFormula = aCorrectedFormula.replaceAt( nPos, 1,
-                                        OUString( mxSymbols->getSymbolChar(ocLess) ) );
+                                        rtl::OUStringChar( mxSymbols->getSymbolChar(ocLess) ) );
                                     aCorrectedSymbol = OUString(c);
                                     bCorrected = true;
                                 }
                                 else if ( c == mxSymbols->getSymbolChar( ocGreater) )
                                 {   // <> instead of ><
                                     aCorrectedFormula = aCorrectedFormula.replaceAt( nPos, 1,
-                                        OUString( mxSymbols->getSymbolChar(ocLess) ) );
+                                        rtl::OUStringChar( mxSymbols->getSymbolChar(ocLess) ) );
                                     aCorrectedSymbol = OUString(c);
                                     bCorrected = true;
                                 }
@@ -2658,7 +2658,7 @@ OpCode FormulaCompiler::NextToken()
                                 if ( c == mxSymbols->getSymbolChar( ocSub) )
                                 {   // *- instead of -*
                                     aCorrectedFormula = aCorrectedFormula.replaceAt( nPos, 1,
-                                        OUString( mxSymbols->getSymbolChar(ocMul) ) );
+                                        rtl::OUStringChar( mxSymbols->getSymbolChar(ocMul) ) );
                                     aCorrectedSymbol = OUString(c);
                                     bCorrected = true;
                                 }
@@ -2667,7 +2667,7 @@ OpCode FormulaCompiler::NextToken()
                                 if ( c == mxSymbols->getSymbolChar( ocSub) )
                                 {   // /- instead of -/
                                     aCorrectedFormula = aCorrectedFormula.replaceAt( nPos, 1,
-                                        OUString( mxSymbols->getSymbolChar(ocDiv) ) );
+                                        rtl::OUStringChar( mxSymbols->getSymbolChar(ocDiv) ) );
                                     aCorrectedSymbol = OUString(c);
                                     bCorrected = true;
                                 }
diff --git a/framework/source/uielement/fontmenucontroller.cxx b/framework/source/uielement/fontmenucontroller.cxx
index 0bbc57c85721..a1081e0427f5 100644
--- a/framework/source/uielement/fontmenucontroller.cxx
+++ b/framework/source/uielement/fontmenucontroller.cxx
@@ -173,7 +173,7 @@ void SAL_CALL FontMenuController::itemActivated( const css::awt::MenuEvent& )
         // TODO: must be replaced by implementation of VCL, when available
         sal_Int32 nIndex = aText.indexOf( '~' );
         if ( nIndex >= 0 )
-            aText = aText.replaceAt( nIndex, 1, "" );
+            aText = aText.replaceAt( nIndex, 1, u"" );
         // TODO: must be replaced by implementation of VCL, when available
 
         if ( aText == m_aFontFamilyName )
diff --git a/i18npool/source/inputchecker/inputsequencechecker.cxx b/i18npool/source/inputchecker/inputsequencechecker.cxx
index 4820c10ca153..ff1ea652f980 100644
--- a/i18npool/source/inputchecker/inputsequencechecker.cxx
+++ b/i18npool/source/inputchecker/inputsequencechecker.cxx
@@ -68,7 +68,7 @@ InputSequenceCheckerImpl::correctInputSequence(OUString& Text, sal_Int32 nStartP
         if (language)
             return getInputSequenceChecker(language)->correctInputSequence(Text, nStartPos, inputChar, inputCheckMode);
     }
-    Text = Text.replaceAt(++nStartPos, 0, OUString(inputChar));
+    Text = Text.replaceAt(++nStartPos, 0, rtl::OUStringChar(inputChar));
     return nStartPos;
 }
 
diff --git a/i18npool/source/inputchecker/inputsequencechecker_hi.cxx b/i18npool/source/inputchecker/inputsequencechecker_hi.cxx
index c857f286650a..b1f9e99f6987 100644
--- a/i18npool/source/inputchecker/inputsequencechecker_hi.cxx
+++ b/i18npool/source/inputchecker/inputsequencechecker_hi.cxx
@@ -126,7 +126,7 @@ InputSequenceChecker_hi::correctInputSequence(OUString& Text,
                                             sal_Int16       inputCheckMode)
 {
     if (checkInputSequence(Text, nStartPos, inputChar, inputCheckMode))
-        Text = Text.replaceAt(++nStartPos, 0, OUString(inputChar));
+        Text = Text.replaceAt(++nStartPos, 0, rtl::OUStringChar(inputChar));
     else
         nStartPos=Text.getLength();
     return nStartPos;
diff --git a/i18npool/source/inputchecker/inputsequencechecker_th.cxx b/i18npool/source/inputchecker/inputsequencechecker_th.cxx
index cf686be78633..c6d6f349d26d 100644
--- a/i18npool/source/inputchecker/inputsequencechecker_th.cxx
+++ b/i18npool/source/inputchecker/inputsequencechecker_th.cxx
@@ -111,26 +111,26 @@ https://bz.apache.org/ooo/show_bug.cgi?id=42661
 #define CT_ABV1(t) (t==CT_AV1 || t==CT_BV1)
 
     if (check(Text[nStartPos], inputChar, inputCheckMode))
-        Text = Text.replaceAt(++nStartPos, 0, OUString(inputChar));
+        Text = Text.replaceAt(++nStartPos, 0, rtl::OUStringChar(inputChar));
     else if (nStartPos > 0 && getCharType(Text[nStartPos-1]) == CT_CONS) {
         sal_uInt16 t1=getCharType(Text[nStartPos]), t2=getCharType(inputChar);
         if ( (CT_ABV(t1) && CT_ABV(t2)) || // 1.
                 (t1==CT_TONE && t2==CT_TONE) )// 2.
-            Text = Text.replaceAt(nStartPos, 1, OUString(inputChar));
+            Text = Text.replaceAt(nStartPos, 1, rtl::OUStringChar(inputChar));
         else if ( (t1==CT_TONE && CT_ABV(t2)) ||  // 5.
                 (t1==CT_FV1 && t2==CT_TONE) ||  // 6.
                 (Text[nStartPos]==0x0E4C && CT_ABV1(t2)) ) // 8.
-            Text = Text.replaceAt(nStartPos++, 0, OUString(inputChar));
+            Text = Text.replaceAt(nStartPos++, 0, rtl::OUStringChar(inputChar));
         else
             nStartPos=Text.getLength();
     } else if (nStartPos > 1 && getCharType(Text[nStartPos-2]) == CT_CONS) {
         sal_uInt16 t1=getCharType(Text[nStartPos-1]), t2=getCharType(Text[nStartPos]), t3=getCharType(inputChar);
         if (CT_ABV(t1) && t2==CT_TONE && t3==CT_TONE) // 3.
-            Text = Text.replaceAt(nStartPos, 1, OUString(inputChar));
+            Text = Text.replaceAt(nStartPos, 1, rtl::OUStringChar(inputChar));
         else if ( (CT_ABV(t1) && t2==CT_TONE && CT_ABV(t3)) || // 4.
                 (t1==CT_TONE && t2==CT_FV1 && t3==CT_TONE) || // 7.
                 (CT_ABV1(t1) && Text[nStartPos]==0x0E4C && CT_ABV1(t3)) ) // 9.
-            Text = Text.replaceAt(nStartPos-1, 1, OUString(inputChar));
+            Text = Text.replaceAt(nStartPos-1, 1, rtl::OUStringChar(inputChar));
         else
             nStartPos=Text.getLength();
     } else
diff --git a/include/comphelper/string.hxx b/include/comphelper/string.hxx
index 349dc17360a4..d4c9ccd1b947 100644
--- a/include/comphelper/string.hxx
+++ b/include/comphelper/string.hxx
@@ -234,7 +234,7 @@ inline OUStringBuffer& padToLength(
     @return original string with token nToken replaced by rNewToken
  */
 COMPHELPER_DLLPUBLIC OUString setToken(const OUString& rIn, sal_Int32 nToken, sal_Unicode cTok,
-    const OUString& rNewToken);
+    std::u16string_view rNewToken);
 
 /** Find any of a list of code units in the string.
     @param rIn      OUString to search
diff --git a/include/rtl/string.h b/include/rtl/string.h
index e0d751f18bd3..f80bef02ca91 100644
--- a/include/rtl/string.h
+++ b/include/rtl/string.h
@@ -1108,6 +1108,11 @@ SAL_DLLPUBLIC void SAL_CALL rtl_string_newConcat( rtl_String ** newStr, rtl_Stri
 SAL_DLLPUBLIC void SAL_CALL rtl_string_newReplaceStrAt(
         rtl_String ** newStr, rtl_String * str, sal_Int32 idx, sal_Int32 count, rtl_String * subStr ) SAL_THROW_EXTERN_C();
 
+#ifdef LIBO_INTERNAL_ONLY
+SAL_DLLPUBLIC void SAL_CALL rtl_string_newReplaceStrAt_WithLength (
+        rtl_String ** newStr, rtl_String * str, sal_Int32 idx, sal_Int32 count, char const * subStr, sal_Int32 substrLen ) SAL_THROW_EXTERN_C();
+#endif
+
 /** Create a new string by replacing all occurrences of a single character
     within another string.
 
diff --git a/include/rtl/string.hxx b/include/rtl/string.hxx
index cebaa114517d..440f80900855 100644
--- a/include/rtl/string.hxx
+++ b/include/rtl/string.hxx
@@ -1594,6 +1594,8 @@ public:
     }
 #endif
 
+// hide this from internal code to avoid ambiguous lookup error
+#ifndef LIBO_INTERNAL_ONLY
     /**
       Returns a new string resulting from replacing n = count characters
       from position index in this string with newStr.
@@ -1613,6 +1615,16 @@ public:
         rtl_string_newReplaceStrAt( &pNew, pData, index, count, newStr.pData );
         return OString( pNew, SAL_NO_ACQUIRE );
     }
+#endif
+
+#ifdef LIBO_INTERNAL_ONLY
+    SAL_WARN_UNUSED_RESULT OString replaceAt( sal_Int32 index, sal_Int32 count, std::string_view newStr ) const
+    {
+        rtl_String* pNew = NULL;
+        rtl_string_newReplaceStrAt_WithLength ( &pNew, pData, index, count, newStr.data(), newStr.size() );
+        return OString( pNew, SAL_NO_ACQUIRE );
+    }
+#endif
 
     /**
       Returns a new string resulting from replacing all occurrences of
diff --git a/include/rtl/ustring.h b/include/rtl/ustring.h
index b4990fec12eb..16ec6ed5931c 100644
--- a/include/rtl/ustring.h
+++ b/include/rtl/ustring.h
@@ -1541,6 +1541,11 @@ SAL_DLLPUBLIC void SAL_CALL rtl_uString_newConcatUtf16L(
 SAL_DLLPUBLIC void SAL_CALL rtl_uString_newReplaceStrAt(
         rtl_uString ** newStr, rtl_uString * str, sal_Int32 idx, sal_Int32 count, rtl_uString * subStr ) SAL_THROW_EXTERN_C();
 
+#ifdef LIBO_INTERNAL_ONLY
+SAL_DLLPUBLIC void SAL_CALL rtl_uString_newReplaceStrAtUtf16L(
+        rtl_uString ** newStr, rtl_uString * str, sal_Int32 idx, sal_Int32 count, sal_Unicode const * subStr, sal_Int32 substrLen ) SAL_THROW_EXTERN_C();
+#endif
+
 /** Create a new string by replacing all occurrences of a single character
     within another string.
 
diff --git a/include/rtl/ustring.hxx b/include/rtl/ustring.hxx
index e14549482f35..13cc367c5589 100644
--- a/include/rtl/ustring.hxx
+++ b/include/rtl/ustring.hxx
@@ -2223,6 +2223,8 @@ public:
     }
 #endif
 
+// hide this from internal code to avoid ambiguous lookup error
+#ifndef LIBO_INTERNAL_ONLY
     /**
       Returns a new string resulting from replacing n = count characters
       from position index in this string with newStr.
@@ -2242,6 +2244,16 @@ public:
         rtl_uString_newReplaceStrAt( &pNew, pData, index, count, newStr.pData );
         return OUString( pNew, SAL_NO_ACQUIRE );
     }
+#endif
+
+#ifdef LIBO_INTERNAL_ONLY
+    SAL_WARN_UNUSED_RESULT OUString replaceAt( sal_Int32 index, sal_Int32 count, std::u16string_view newStr ) const
+    {
+        rtl_uString* pNew = NULL;
+        rtl_uString_newReplaceStrAtUtf16L( &pNew, pData, index, count, newStr.data(), newStr.size() );
+        return OUString( pNew, SAL_NO_ACQUIRE );
+    }
+#endif
 
     /**
       Returns a new string resulting from replacing all occurrences of
diff --git a/oox/source/drawingml/chart/chartconverter.cxx b/oox/source/drawingml/chart/chartconverter.cxx
index af49c561ae51..e3b2abe6b942 100644
--- a/oox/source/drawingml/chart/chartconverter.cxx
+++ b/oox/source/drawingml/chart/chartconverter.cxx
@@ -50,7 +50,7 @@ static OUString lclGenerateApiString( const OUString& rString )
     OUString aRetString = rString;
     sal_Int32 nQuotePos = aRetString.getLength();
     while( (nQuotePos = aRetString.lastIndexOf( '"', nQuotePos )) >= 0 )
-        aRetString = aRetString.replaceAt( nQuotePos, 1, "\"\"" );
+        aRetString = aRetString.replaceAt( nQuotePos, 1, u"\"\"" );
     return "\"" + aRetString + "\"";
 }
 
diff --git a/oox/source/ole/vbaexport.cxx b/oox/source/ole/vbaexport.cxx
index 2c24593c981e..a5f54160094b 100644
--- a/oox/source/ole/vbaexport.cxx
+++ b/oox/source/ole/vbaexport.cxx
@@ -798,7 +798,7 @@ void exportModuleStream(SvStream& rStrm, const OUString& rSourceCode, const OUSt
     const sal_Int32 nPos = aSourceCode.indexOf("Rem Attribute VBA_ModuleType=");
     const sal_Int32 nEndPos = nPos != -1 ? aSourceCode.indexOf("\n", nPos) : -1;
     if (nPos != -1 && nEndPos != -1)
-        aSourceCode = aSourceCode.replaceAt(nPos, nEndPos - nPos+1, "");
+        aSourceCode = aSourceCode.replaceAt(nPos, nEndPos - nPos+1, u"");
     aSourceCode = aSourceCode.replaceAll("\n", "\r\n");
     exportString(aModuleStream, aSourceCode);
 
diff --git a/reportdesign/source/core/api/Group.cxx b/reportdesign/source/core/api/Group.cxx
index 5a60997d5bf0..165214513bbe 100644
--- a/reportdesign/source/core/api/Group.cxx
+++ b/reportdesign/source/core/api/Group.cxx
@@ -171,7 +171,7 @@ uno::Reference< report::XSection > SAL_CALL OGroup::getFooter()
 void SAL_CALL OGroup::setGroupOn( ::sal_Int16 _groupon )
 {
     if ( _groupon < report::GroupOn::DEFAULT || _groupon > report::GroupOn::INTERVAL )
-        throwIllegallArgumentException("css::report::GroupOn"
+        throwIllegallArgumentException(u"css::report::GroupOn"
                         ,*this
                         ,1);
     set(PROPERTY_GROUPON,_groupon,m_aProps.m_nGroupOn);
@@ -197,7 +197,7 @@ void SAL_CALL OGroup::setGroupInterval( ::sal_Int32 _groupinterval )
 void SAL_CALL OGroup::setKeepTogether( ::sal_Int16 _keeptogether )
 {
     if ( _keeptogether < report::KeepTogether::NO || _keeptogether > report::KeepTogether::WITH_FIRST_DETAIL )
-        throwIllegallArgumentException("css::report::KeepTogether"
+        throwIllegallArgumentException(u"css::report::KeepTogether"
                         ,*this
                         ,1);
     set(PROPERTY_KEEPTOGETHER,_keeptogether,m_aProps.m_nKeepTogether);
diff --git a/reportdesign/source/core/api/ReportDefinition.cxx b/reportdesign/source/core/api/ReportDefinition.cxx
index ad35f9e34354..39785167d6c0 100644
--- a/reportdesign/source/core/api/ReportDefinition.cxx
+++ b/reportdesign/source/core/api/ReportDefinition.cxx
@@ -762,7 +762,7 @@ void SAL_CALL OReportDefinition::setCaption( const OUString& _caption )
 void SAL_CALL OReportDefinition::setGroupKeepTogether( ::sal_Int16 _groupkeeptogether )
 {
     if ( _groupkeeptogether < report::GroupKeepTogether::PER_PAGE || _groupkeeptogether > report::GroupKeepTogether::PER_COLUMN )
-        throwIllegallArgumentException("css::report::GroupKeepTogether"
+        throwIllegallArgumentException(u"css::report::GroupKeepTogether"
                         ,*this
                         ,1);
     set(PROPERTY_GROUPKEEPTOGETHER,_groupkeeptogether,m_pImpl->m_nGroupKeepTogether);
@@ -777,7 +777,7 @@ void SAL_CALL OReportDefinition::setGroupKeepTogether( ::sal_Int16 _groupkeeptog
 void SAL_CALL OReportDefinition::setPageHeaderOption( ::sal_Int16 _pageheaderoption )
 {
     if ( _pageheaderoption < report::ReportPrintOption::ALL_PAGES || _pageheaderoption > report::ReportPrintOption::NOT_WITH_REPORT_HEADER_FOOTER )
-        throwIllegallArgumentException("css::report::ReportPrintOption"
+        throwIllegallArgumentException(u"css::report::ReportPrintOption"
                         ,*this
                         ,1);
     set(PROPERTY_PAGEHEADEROPTION,_pageheaderoption,m_pImpl->m_nPageHeaderOption);
@@ -792,7 +792,7 @@ void SAL_CALL OReportDefinition::setPageHeaderOption( ::sal_Int16 _pageheaderopt
 void SAL_CALL OReportDefinition::setPageFooterOption( ::sal_Int16 _pagefooteroption )
 {
     if ( _pagefooteroption < report::ReportPrintOption::ALL_PAGES || _pagefooteroption > report::ReportPrintOption::NOT_WITH_REPORT_HEADER_FOOTER )
-        throwIllegallArgumentException("css::report::ReportPrintOption"
+        throwIllegallArgumentException(u"css::report::ReportPrintOption"
                         ,*this
                         ,1);
     set(PROPERTY_PAGEFOOTEROPTION,_pagefooteroption,m_pImpl->m_nPageFooterOption);
@@ -818,7 +818,7 @@ void SAL_CALL OReportDefinition::setCommand( const OUString& _command )
 void SAL_CALL OReportDefinition::setCommandType( ::sal_Int32 _commandtype )
 {
     if ( _commandtype < sdb::CommandType::TABLE || _commandtype > sdb::CommandType::COMMAND )
-        throwIllegallArgumentException("css::sdb::CommandType"
+        throwIllegallArgumentException(u"css::sdb::CommandType"
                         ,*this
                         ,1);
     set(PROPERTY_COMMANDTYPE,_commandtype,m_pImpl->m_nCommandType);
@@ -1920,7 +1920,7 @@ void SAL_CALL OReportDefinition::setMimeType( const OUString& _mimetype )
     ::connectivity::checkDisposed(ReportDefinitionBase::rBHelper.bDisposed);
     const uno::Sequence< OUString > aList = getAvailableMimeTypes();
     if ( ::std::find(aList.begin(), aList.end(), _mimetype) == aList.end() )
-        throwIllegallArgumentException("getAvailableMimeTypes()"
+        throwIllegallArgumentException(u"getAvailableMimeTypes()"
                         ,*this
                         ,1);
     set(PROPERTY_MIMETYPE,_mimetype,m_pImpl->m_sMimeType);
diff --git a/reportdesign/source/core/api/Section.cxx b/reportdesign/source/core/api/Section.cxx
index bed193b3242f..62795c756ab2 100644
--- a/reportdesign/source/core/api/Section.cxx
+++ b/reportdesign/source/core/api/Section.cxx
@@ -303,7 +303,7 @@ void OSection::checkNotPageHeaderFooter()
 void SAL_CALL OSection::setForceNewPage( ::sal_Int16 _forcenewpage )
 {
     if ( _forcenewpage < report::ForceNewPage::NONE || _forcenewpage > report::ForceNewPage::BEFORE_AFTER_SECTION )
-        throwIllegallArgumentException("css::report::ForceNewPage"
+        throwIllegallArgumentException(u"css::report::ForceNewPage"
                         ,*this
                         ,1);
     checkNotPageHeaderFooter();
@@ -320,7 +320,7 @@ void SAL_CALL OSection::setForceNewPage( ::sal_Int16 _forcenewpage )
 void SAL_CALL OSection::setNewRowOrCol( ::sal_Int16 _newroworcol )
 {
     if ( _newroworcol < report::ForceNewPage::NONE || _newroworcol > report::ForceNewPage::BEFORE_AFTER_SECTION )
-        throwIllegallArgumentException("css::report::ForceNewPage"
+        throwIllegallArgumentException(u"css::report::ForceNewPage"
                         ,*this
                         ,1);
     checkNotPageHeaderFooter();
diff --git a/reportdesign/source/core/api/Tools.cxx b/reportdesign/source/core/api/Tools.cxx
index 5d21217cc450..8f066a68d668 100644
--- a/reportdesign/source/core/api/Tools.cxx
+++ b/reportdesign/source/core/api/Tools.cxx
@@ -40,7 +40,7 @@ uno::Reference< report::XSection> lcl_getSection(const uno::Reference< uno::XInt
     return xRet;
 }
 
-void throwIllegallArgumentException( const OUString& _sTypeName
+void throwIllegallArgumentException( std::u16string_view _sTypeName
                                     ,const uno::Reference< uno::XInterface >& ExceptionContext_
                                     ,sal_Int16 ArgumentPosition_
                                     )
diff --git a/reportdesign/source/core/inc/Tools.hxx b/reportdesign/source/core/inc/Tools.hxx
index 004d4cc4f77a..3e0a699cef21 100644
--- a/reportdesign/source/core/inc/Tools.hxx
+++ b/reportdesign/source/core/inc/Tools.hxx
@@ -45,7 +45,7 @@ namespace reportdesign
      * \param ExceptionContext_ The exception context.
      * \param ArgumentPosition_ The argument position.
      */
-    void throwIllegallArgumentException(const OUString& _sTypeName
+    void throwIllegallArgumentException(std::u16string_view _sTypeName
                                         ,const css::uno::Reference< css::uno::XInterface >& ExceptionContext_
                                         ,sal_Int16 ArgumentPosition_);
 
diff --git a/reportdesign/source/filter/xml/xmlExport.cxx b/reportdesign/source/filter/xml/xmlExport.cxx
index d9a673e81250..222bb423e79e 100644
--- a/reportdesign/source/filter/xml/xmlExport.cxx
+++ b/reportdesign/source/filter/xml/xmlExport.cxx
@@ -1041,7 +1041,7 @@ void ORptExport::exportGroup(const Reference<XReportDefinition>& _xReportDefinit
                 sal_Int32 nIndex = sExpression.indexOf('"');
                 while ( nIndex > -1 )
                 {
-                    sExpression = sExpression.replaceAt(nIndex, 1, "\"\"");
+                    sExpression = sExpression.replaceAt(nIndex, 1, u"\"\"");
                     nIndex = sExpression.indexOf('"',nIndex+2);
                 }
 
diff --git a/reportdesign/source/filter/xml/xmlGroup.cxx b/reportdesign/source/filter/xml/xmlGroup.cxx
index 1c8681494217..355ed8feab8f 100644
--- a/reportdesign/source/filter/xml/xmlGroup.cxx
+++ b/reportdesign/source/filter/xml/xmlGroup.cxx
@@ -91,7 +91,7 @@ OXMLGroup::OXMLGroup( ORptFilter& _rImport
                                 sal_Int32 nIndex = sValue.indexOf(s_sQuote,nPos);
                                 while ( nIndex > -1 )
                                 {
-                                    sValue = sValue.replaceAt(nIndex,2, "\"");
+                                    sValue = sValue.replaceAt(nIndex,2, u"\"");
                                     nIndex = sValue.indexOf(s_sQuote,nIndex+2);
                                 }
                                 nLen = sValue.getLength() - 1;
diff --git a/reportdesign/source/ui/dlg/Formula.cxx b/reportdesign/source/ui/dlg/Formula.cxx
index f1b95f953c62..f2b95e0df1b7 100644
--- a/reportdesign/source/ui/dlg/Formula.cxx
+++ b/reportdesign/source/ui/dlg/Formula.cxx
@@ -152,7 +152,7 @@ void FormulaDialog::setCurrentFormula(const OUString& _sReplacement)
     const sal_Int32 nOldLen = m_nEnd - m_nStart;
     const sal_Int32 nNewLen = _sReplacement.getLength();
     if (nOldLen)
-        m_sFormula = m_sFormula.replaceAt( m_nStart, nOldLen, "" );
+        m_sFormula = m_sFormula.replaceAt( m_nStart, nOldLen, u"" );
     if (nNewLen)
         m_sFormula = m_sFormula.replaceAt( m_nStart, 0, _sReplacement );
     m_nEnd = m_nStart + nNewLen;
diff --git a/sal/rtl/bootstrap.cxx b/sal/rtl/bootstrap.cxx
index e651a8436363..93d1c5a11648 100644
--- a/sal/rtl/bootstrap.cxx
+++ b/sal/rtl/bootstrap.cxx
@@ -255,7 +255,7 @@ static OUString & getIniFileName_Impl()
             // rc files in LIBO_ETC_FOLDER (typically "Resources").
             sal_Int32 off = fileName.lastIndexOf( "/MacOS/" );
             if (off != -1)
-                fileName = fileName.replaceAt(off + 1, strlen("MacOS"), LIBO_ETC_FOLDER);
+                fileName = fileName.replaceAt(off + 1, strlen("MacOS"), u"" LIBO_ETC_FOLDER);
 #endif
         }
 #endif
diff --git a/sal/rtl/string.cxx b/sal/rtl/string.cxx
index b8a96d43a07b..d67246dc159c 100644
--- a/sal/rtl/string.cxx
+++ b/sal/rtl/string.cxx
@@ -659,6 +659,35 @@ void SAL_CALL rtl_string_newConcat(rtl_String** ppThis, rtl_String* pLeft, rtl_S
     rtl::str::newConcat(ppThis, pLeft, pRight);
 }
 
+static void rtl_string_newConcatL(
+    rtl_String ** newString, rtl_String * left, char const * right,
+    sal_Int32 rightLength)
+{
+    assert(newString != nullptr);
+    assert(left != nullptr);
+    assert(right != nullptr || rightLength == 0);
+    assert(rightLength >= 0);
+    if (left->length > std::numeric_limits<sal_Int32>::max() - rightLength) {
+#if !defined(__COVERITY__)
+        throw std::length_error("rtl_string_newConcatL");
+#else
+        //coverity doesn't report std::bad_alloc as an unhandled exception when
+        //potentially thrown from destructors but does report std::length_error
+        throw std::bad_alloc();
+#endif
+    }
+    sal_Int32 n = left->length + rightLength;
+    rtl_string_assign(newString, left);
+    rtl_string_ensureCapacity(newString, n);
+    if (rightLength != 0) {
+        memcpy(
+            (*newString)->buffer + (*newString)->length, right,
+            rightLength);
+    }
+    (*newString)->buffer[n] = 0;
+    (*newString)->length = n;
+}
+
 void SAL_CALL rtl_string_ensureCapacity(rtl_String** ppThis, sal_Int32 size) SAL_THROW_EXTERN_C()
 {
     rtl::str::ensureCapacity(ppThis, size);
@@ -671,6 +700,13 @@ void SAL_CALL rtl_string_newReplaceStrAt(rtl_String** ppThis, rtl_String* pStr,
     rtl::str::newReplaceStrAt(ppThis, pStr, nIndex, nCount, pNewSubStr);
 }
 
+void SAL_CALL rtl_string_newReplaceStrAt_WithLength(rtl_String** ppThis, rtl_String* pStr, sal_Int32 nIndex,
+                                         sal_Int32 nCount, char const * subStr, sal_Int32 substrLen)
+    SAL_THROW_EXTERN_C()
+{
+    rtl::str::newReplaceStrAt(ppThis, pStr, nIndex, nCount, subStr, substrLen);
+}
+
 void SAL_CALL rtl_string_newReplace(rtl_String** ppThis, rtl_String* pStr, char cOld, char cNew)
     SAL_THROW_EXTERN_C()
 {
diff --git a/sal/rtl/strtmpl.hxx b/sal/rtl/strtmpl.hxx
index f26c21225177..7a909bb5efe3 100644
--- a/sal/rtl/strtmpl.hxx
+++ b/sal/rtl/strtmpl.hxx
@@ -1466,6 +1466,80 @@ void newReplaceStrAt                                ( IMPL_RTL_STRINGDATA** ppTh
 
 /* ----------------------------------------------------------------------- */
 
+template <typename IMPL_RTL_STRINGDATA, typename IMPL_RTL_STRCODE>
+void newReplaceStrAt                                ( IMPL_RTL_STRINGDATA** ppThis,
+                                                      IMPL_RTL_STRINGDATA* pStr,
+                                                      sal_Int32 nIndex,
+                                                      sal_Int32 nCount,
+                                                      const IMPL_RTL_STRCODE* pNewSubStr,
+                                                      sal_Int32 nNewSubStrLen )
+{
+    assert(ppThis);
+    assert(nIndex >= 0 && nIndex <= pStr->length);
+    assert(nCount >= 0);
+    assert(nCount <= pStr->length - nIndex);
+    assert(pNewSubStr);
+    assert(nNewSubStrLen >= 0);
+    /* Append? */
+    if ( nIndex >= pStr->length )
+    {
+        if constexpr (sizeof(IMPL_RTL_STRCODE) == sizeof(char))
+            rtl_string_newConcatL( ppThis, pStr, pNewSubStr, nNewSubStrLen );
+        else
+            rtl_uString_newConcatUtf16L( ppThis, pStr, pNewSubStr, nNewSubStrLen );
+        return;
+    }
+
+    /* not more than the String length could be deleted */
+    if ( nCount >= pStr->length-nIndex )
+    {
+        nCount = pStr->length-nIndex;
+
+        /* Assign of NewSubStr? */
+        if ( !nIndex && (nCount >= pStr->length) )
+        {
+            newFromStr_WithLength( ppThis, pNewSubStr, nNewSubStrLen );
+            return;
+        }
+    }
+
+    /* Assign of Str? */
+    if ( !nCount && !nNewSubStrLen )
+    {
+        assign( ppThis, pStr );
+        return;
+    }
+
+    IMPL_RTL_STRINGDATA*    pOrg = *ppThis;
+    sal_Int32               nNewLen;
+
+    /* Calculate length of the new string */
+    nNewLen = pStr->length-nCount + nNewSubStrLen;
+
+    /* Alloc New Buffer */
+    *ppThis = Alloc<IMPL_RTL_STRINGDATA>( nNewLen );
+    OSL_ASSERT(*ppThis != nullptr);
+    auto* pBuffer = (*ppThis)->buffer;
+    if ( nIndex )
+    {
+        Copy( pBuffer, pStr->buffer, nIndex );
+        pBuffer += nIndex;
+    }
+    if ( nNewSubStrLen )
+    {
+        Copy( pBuffer, pNewSubStr, nNewSubStrLen );
+        pBuffer += nNewSubStrLen;
+    }
+    Copy( pBuffer, pStr->buffer+nIndex+nCount, pStr->length-nIndex-nCount );
+
+    RTL_LOG_STRING_NEW( *ppThis );
+    /* must be done last, if pStr or pNewSubStr == *ppThis */
+    if ( pOrg )
+        release( pOrg );
+}
+
+/* ----------------------------------------------------------------------- */
+
 template <typename IMPL_RTL_STRINGDATA>
 void newReplace                                ( IMPL_RTL_STRINGDATA** ppThis,
                                                  IMPL_RTL_STRINGDATA* pStr,
diff --git a/sal/rtl/ustring.cxx b/sal/rtl/ustring.cxx
index ee84510bcc7f..64f13cabc7ee 100644
--- a/sal/rtl/ustring.cxx
+++ b/sal/rtl/ustring.cxx
@@ -1866,6 +1866,13 @@ void SAL_CALL rtl_uString_newReplaceStrAt(rtl_uString** ppThis, rtl_uString* pSt
     rtl::str::newReplaceStrAt(ppThis, pStr, nIndex, nCount, pNewSubStr);
 }
 
+void SAL_CALL rtl_uString_newReplaceStrAtUtf16L(rtl_uString** ppThis, rtl_uString* pStr, sal_Int32 nIndex,
+                                          sal_Int32 nCount, sal_Unicode const * subStr, sal_Int32 substrLen)
+    SAL_THROW_EXTERN_C()
+{
+    rtl::str::newReplaceStrAt(ppThis, pStr, nIndex, nCount, subStr, substrLen);
+}
+
 void SAL_CALL rtl_uString_newReplace(rtl_uString** ppThis, rtl_uString* pStr, sal_Unicode cOld,
                                      sal_Unicode cNew) SAL_THROW_EXTERN_C()
 {
diff --git a/sal/util/sal.map b/sal/util/sal.map
index 49efb2a436cd..c5c3e4d55641 100644
--- a/sal/util/sal.map
+++ b/sal/util/sal.map
@@ -755,6 +755,12 @@ PRIVATE_1.7 { # LibreOffice 7.1
         rtl_uString_newReplaceAllFromIndexUtf16LUtf16L;
 } PRIVATE_1.5;
 
+PRIVATE_1.8 { # LibreOffice 7.3
+    global:
+        rtl_string_newReplaceStrAt_WithLength;
+        rtl_uString_newReplaceStrAtUtf16L;
+} PRIVATE_1.7;
+
 PRIVATE_textenc.1 { # LibreOffice 3.6
     global:
         _ZN3sal6detail7textenc20convertCharToUnicode*;
diff --git a/sc/qa/unit/subsequent_export_test2.cxx b/sc/qa/unit/subsequent_export_test2.cxx
index c585d2394c27..a74fff7e04af 100644
--- a/sc/qa/unit/subsequent_export_test2.cxx
+++ b/sc/qa/unit/subsequent_export_test2.cxx
@@ -2328,7 +2328,7 @@ void ScExportTest2::testTdf87973_externalLinkSkipUnuseds()
     // change external link to: 87973_externalSource.ods
     OUString aFormula = rDoc.GetFormula(3, 1, 0);
     auto nIdxOfFilename = aFormula.indexOf("tdf132105_external.ods");
-    aFormula = aFormula.replaceAt(nIdxOfFilename, 22, "87973_externalSource.ods");
+    aFormula = aFormula.replaceAt(nIdxOfFilename, 22, u"87973_externalSource.ods");
     auto nIdxOfFile = aFormula.indexOf("file");
 
     // saveAndReload save the file to a temporary directory
@@ -2344,7 +2344,7 @@ void ScExportTest2::testTdf87973_externalLinkSkipUnuseds()
     // tdf#138832: test the same thing with singleref link
     aFormula = rDoc.GetFormula(3, 2, 0);
     nIdxOfFilename = aFormula.indexOf("tdf132105_external.ods");
-    aFormula = aFormula.replaceAt(nIdxOfFilename, 22, "87973_externalSource.ods");
+    aFormula = aFormula.replaceAt(nIdxOfFilename, 22, u"87973_externalSource.ods");
     nIdxOfFile = aFormula.indexOf("file");
 
     aFormula = aFormula.replaceAt(nIdxOfFile, nIdxOfFilename - nIdxOfFile, aTempFilename);
diff --git a/sc/source/core/data/global2.cxx b/sc/source/core/data/global2.cxx
index 356379dc3f1f..5dcbbdd11709 100644
--- a/sc/source/core/data/global2.cxx
+++ b/sc/source/core/data/global2.cxx
@@ -326,7 +326,7 @@ OUString ScGlobal::GetDocTabName( std::u16string_view rFileName,
     sal_Int32 nPos = 1;
     while( (nPos = aDocTab.indexOf( '\'', nPos )) != -1 )
     {   // escape Quotes
-        aDocTab = aDocTab.replaceAt( nPos, 0, "\\" );
+        aDocTab = aDocTab.replaceAt( nPos, 0, u"\\" );
         nPos += 2;
     }
     aDocTab += "'" + OUStringChar(SC_COMPILER_FILE_TAB_SEP) + rTabName;
diff --git a/sc/source/core/tool/address.cxx b/sc/source/core/tool/address.cxx
index ae4d48787fe3..c09628608bd2 100644
--- a/sc/source/core/tool/address.cxx
+++ b/sc/source/core/tool/address.cxx
@@ -547,7 +547,7 @@ const sal_Unicode* ScRange::Parse_XL_Header(
                 else
                 {
                     rExternDocName = rExternDocName.copy(0, nClose);
-                    rExternDocName = rExternDocName.replaceAt( nOpen, 1, "");
+                    rExternDocName = rExternDocName.replaceAt( nOpen, 1, u"");
                     pMsoxlQuoteStop = p - 1;    // the ' quote char
                     // There may be embedded escaped quotes, just matching the
                     // doc name's length may not work.
diff --git a/sc/source/core/tool/compiler.cxx b/sc/source/core/tool/compiler.cxx
index 952a53423b3f..2c8bf6c5655b 100644
--- a/sc/source/core/tool/compiler.cxx
+++ b/sc/source/core/tool/compiler.cxx
@@ -4118,9 +4118,9 @@ void ScCompiler::AutoCorrectParsedSymbol()
                 (ScCharFlags::Word | ScCharFlags::CharDontCare)) == ScCharFlags::NONE)) )
             nPos--;
         if ( nPos == MAXSTRLEN - 1 )
-            aCorrectedSymbol = aCorrectedSymbol.replaceAt( nPos, 1, OUString(cQuote) );   // '"' the MAXSTRLENth character
+            aCorrectedSymbol = aCorrectedSymbol.replaceAt( nPos, 1, rtl::OUStringChar(cQuote) );   // '"' the MAXSTRLENth character
         else
-            aCorrectedSymbol = aCorrectedSymbol.replaceAt( nPos + 1, 0, OUString(cQuote) );
+            aCorrectedSymbol = aCorrectedSymbol.replaceAt( nPos + 1, 0, rtl::OUStringChar(cQuote) );
         bCorrected = true;
     }
     else if ( c1 != cQuote && c2 == cQuote )
@@ -5448,7 +5448,7 @@ bool ScCompiler::EnQuote( OUString& rStr )
     sal_Int32 nPos = 0;
     while ( (nPos = rStr.indexOf( '\'', nPos)) != -1 )
     {
-        rStr = rStr.replaceAt( nPos, 0, "\\" );
+        rStr = rStr.replaceAt( nPos, 0, u"\\" );
         nPos += 2;
     }
     rStr = "'" + rStr + "'";
diff --git a/sc/source/core/tool/interpr1.cxx b/sc/source/core/tool/interpr1.cxx
index 4e1471c46fbc..fae8a6eeb222 100644
--- a/sc/source/core/tool/interpr1.cxx
+++ b/sc/source/core/tool/interpr1.cxx
@@ -3412,12 +3412,12 @@ void ScInterpreter::ScNumberValue()
     {
         sal_Unicode c = aInputString[ i ];
         if ( c == 0x0020 || c == 0x0009 || c == 0x000A || c == 0x000D )
-            aInputString = aInputString.replaceAt( i, 1, "" ); // remove spaces etc.
+            aInputString = aInputString.replaceAt( i, 1, u"" ); // remove spaces etc.
     }
     sal_Int32 nPercentCount = 0;
     for ( sal_Int32 i = aInputString.getLength() - 1; i >= 0 && aInputString[ i ] == 0x0025; i-- )
     {
-        aInputString = aInputString.replaceAt( i, 1, "" );  // remove and count trailing '%'
+        aInputString = aInputString.replaceAt( i, 1, u"" );  // remove and count trailing '%'
         nPercentCount++;
     }
 
@@ -3446,7 +3446,7 @@ void ScInterpreter::ScClean()
     for ( sal_Int32 i = 0; i < aStr.getLength(); i++ )
     {
         if ( !lcl_ScInterpreter_IsPrintable( aStr[i] ) )
-            aStr = aStr.replaceAt(i,1,"");
+            aStr = aStr.replaceAt(i, 1, u"");
     }
     PushString(aStr);
 }
@@ -8860,7 +8860,7 @@ void ScInterpreter::ScReplace()
             aOldStr.iterateCodePoints( &nIdx );
             ++nCnt;
         }
-        aOldStr = aOldStr.replaceAt( nStart, nIdx - nStart, "" );
+        aOldStr = aOldStr.replaceAt( nStart, nIdx - nStart, u"" );
         if ( CheckStringResultLen( aOldStr, aNewStr ) )
             aOldStr = aOldStr.replaceAt( nStart, 0, aNewStr );
         PushString( aOldStr );
@@ -9700,7 +9700,7 @@ void ScInterpreter::ScSubstitute()
             nCount++;
             if( !nCnt || nCount == nCnt )
             {
-                sStr = sStr.replaceAt(nPos,nOldLen, "");
+                sStr = sStr.replaceAt(nPos,nOldLen, u"");
                 if ( CheckStringResultLen( sStr, sNewStr ) )
                 {
                     sStr = sStr.replaceAt(nPos, 0, sNewStr);
diff --git a/sc/source/core/tool/rangenam.cxx b/sc/source/core/tool/rangenam.cxx
index a0d213ed3c9a..11e177158148 100644
--- a/sc/source/core/tool/rangenam.cxx
+++ b/sc/source/core/tool/rangenam.cxx
@@ -440,7 +440,7 @@ void ScRangeData::MakeValidName( const ScDocument& rDoc, OUString& rName )
     for (nPos=0; nPos<nLen; nPos++)
     {
         if ( !ScCompiler::IsCharFlagAllConventions( rName, nPos, ScCharFlags::Name) )
-            rName = rName.replaceAt( nPos, 1, "_" );
+            rName = rName.replaceAt( nPos, 1, u"_" );
     }
 
     // Ensure that the proposed name is not a reference under any convention,
diff --git a/sc/source/core/tool/rangeutl.cxx b/sc/source/core/tool/rangeutl.cxx
index 439f00a6cb97..c5901c834b40 100644
--- a/sc/source/core/tool/rangeutl.cxx
+++ b/sc/source/core/tool/rangeutl.cxx
@@ -519,7 +519,7 @@ bool ScRangeStringConverter::GetRangeFromString(
 
             if ( nIndex < aUIString.getLength() - 1 &&
                     aUIString[ nIndex + 1 ] == '.' )
-                aUIString = aUIString.replaceAt( nIndex + 1, 1, "" );
+                aUIString = aUIString.replaceAt( nIndex + 1, 1, u"" );
 
             bResult = ((rRange.Parse(aUIString, rDocument, eConv) & ScRefFlags::VALID) ==
                                                                                               ScRefFlags::VALID);
diff --git a/sc/source/filter/dif/difexp.cxx b/sc/source/filter/dif/difexp.cxx
index 18706b2c0916..4e5984f9e943 100644
--- a/sc/source/filter/dif/difexp.cxx
+++ b/sc/source/filter/dif/difexp.cxx
@@ -204,7 +204,7 @@ void ScFormatFilterPluginImpl::ScExportDif( SvStream& rOut, ScDocument* pDoc,
                     sal_Int32 nPos = aTmpStr.indexOf( cStrDelim );
                     while ( nPos != -1 )
                     {
-                        aTmpStr = aTmpStr.replaceAt( nPos, 0, OUString(cStrDelim) );
+                        aTmpStr = aTmpStr.replaceAt( nPos, 0, rtl::OUStringChar(cStrDelim) );
                         nPos = aTmpStr.indexOf( cStrDelim, nPos+2 );
                     }
                     rOut.WriteUniOrByteChar( cStrDelim, eCharSet );
diff --git a/sc/source/filter/excel/xecontent.cxx b/sc/source/filter/excel/xecontent.cxx
index 006e3cb2c956..17a614b8fdf3 100644
--- a/sc/source/filter/excel/xecontent.cxx
+++ b/sc/source/filter/excel/xecontent.cxx
@@ -425,7 +425,7 @@ XclExpHyperlink::XclExpHyperlink( const XclExpRoot& rRoot, const SvxURLField& rU
         if(nSepPos < nPointPos)
         {
            nSepPos = nPointPos;
-           aTextMark = aTextMark.replaceAt( nSepPos, 1, "!" );
+           aTextMark = aTextMark.replaceAt( nSepPos, 1, u"!" );
         }
 
         if (nSepPos != -1)
@@ -434,7 +434,7 @@ XclExpHyperlink::XclExpHyperlink( const XclExpRoot& rRoot, const SvxURLField& rU
 
             if (aSheetName.indexOf(' ') != -1 && aSheetName[0] != '\'')
             {
-                aTextMark = "'" + aTextMark.replaceAt(nSepPos, 0, "'");
+                aTextMark = "'" + aTextMark.replaceAt(nSepPos, 0, u"'");
             }
         }
         else
diff --git a/sc/source/filter/excel/xicontent.cxx b/sc/source/filter/excel/xicontent.cxx
index c12d39376d56..872632a1c061 100644
--- a/sc/source/filter/excel/xicontent.cxx
+++ b/sc/source/filter/excel/xicontent.cxx
@@ -341,7 +341,7 @@ OUString XclImpHyperlink::ReadEmbeddedData( XclImpStream& rStrm )
                         ScRange aRange;
                         if ((aRange.ParseAny( xTextMark->copy( nSepPos + 1 ), rDoc, formula::FormulaGrammar::CONV_XL_R1C1)
                                         & ScRefFlags::VALID) == ScRefFlags::ZERO)
-                            xTextMark.reset( new OUString( xTextMark->replaceAt( nSepPos, 1, OUString( '.' ))));
+                            xTextMark.reset( new OUString( xTextMark->replaceAt( nSepPos, 1, rtl::OUStringChar( '.' ))));
                     }
                 }
             }
diff --git a/sc/source/filter/excel/xiescher.cxx b/sc/source/filter/excel/xiescher.cxx
index c1749c310ab6..298517b0f5b0 100644
--- a/sc/source/filter/excel/xiescher.cxx
+++ b/sc/source/filter/excel/xiescher.cxx
@@ -2111,7 +2111,7 @@ void XclImpTbxObjBase::ConvertLabel( ScfPropertySet& rPropSet ) const
         {
             sal_Int32 nPos = aLabel.indexOf( static_cast< sal_Unicode >( maTextData.maData.mnShortcut ) );
             if( nPos != -1 )
-                aLabel = aLabel.replaceAt( nPos, 0, "~" );
+                aLabel = aLabel.replaceAt( nPos, 0, u"~" );
         }
         rPropSet.SetStringProperty( "Label", aLabel );
 
diff --git a/sc/source/filter/ftools/ftools.cxx b/sc/source/filter/ftools/ftools.cxx
index d82b84a2eb60..9605dc7a46f7 100644
--- a/sc/source/filter/ftools/ftools.cxx
+++ b/sc/source/filter/ftools/ftools.cxx
@@ -152,10 +152,10 @@ OUString ScfTools::ConvertToScDefinedName(const OUString& rName )
         u'_');
     sal_Int32 nLen = sName.getLength();
     if( nLen && !ScCompiler::IsCharFlagAllConventions( sName, 0, ScCharFlags::CharName ) )
-        sName = sName.replaceAt( 0, 1, "_" );
+        sName = sName.replaceAt( 0, 1, u"_" );
     for( sal_Int32 nPos = 1; nPos < nLen; ++nPos )
         if( !ScCompiler::IsCharFlagAllConventions( sName, nPos, ScCharFlags::Name ) )
-            sName = sName.replaceAt( nPos, 1, "_" );
+            sName = sName.replaceAt( nPos, 1, u"_" );
     return sName;
 }
 
diff --git a/sc/source/filter/oox/formulabase.cxx b/sc/source/filter/oox/formulabase.cxx
index 3cb012bda7c8..2dcc513f21a9 100644
--- a/sc/source/filter/oox/formulabase.cxx
+++ b/sc/source/filter/oox/formulabase.cxx
@@ -1566,7 +1566,7 @@ OUString FormulaProcessorBase::generateApiString( const OUString& rString )
     OUString aRetString = rString;
     sal_Int32 nQuotePos = aRetString.getLength();
     while( (nQuotePos = aRetString.lastIndexOf( '"', nQuotePos )) >= 0 )
-        aRetString = aRetString.replaceAt( nQuotePos, 1, "\"\"" );
+        aRetString = aRetString.replaceAt( nQuotePos, 1, u"\"\"" );
     return "\"" + aRetString + "\"";
 }
 
diff --git a/sc/source/filter/oox/worksheetbuffer.cxx b/sc/source/filter/oox/worksheetbuffer.cxx
index c4daa9cd98bd..a00f6cb6cc78 100644
--- a/sc/source/filter/oox/worksheetbuffer.cxx
+++ b/sc/source/filter/oox/worksheetbuffer.cxx
@@ -134,7 +134,7 @@ void WorksheetBuffer::convertSheetNameRef( OUString& sSheetNameRef ) const
         ScRange aRange;
         if ((aRange.ParseAny( sSheetNameRef.copy( nSepPos + 1 ), getScDocument(),
                         formula::FormulaGrammar::CONV_XL_R1C1) & ScRefFlags::VALID) == ScRefFlags::ZERO)
-            sSheetNameRef = sSheetNameRef.replaceAt( nSepPos, 1, OUString( '.' ) );
+            sSheetNameRef = sSheetNameRef.replaceAt( nSepPos, 1, rtl::OUStringChar( '.' ) );
     }
     // #i66592# convert sheet names that have been renamed on import
     OUString aSheetName = sSheetNameRef.copy( 1, nSepPos - 1 );
diff --git a/sc/source/filter/oox/worksheethelper.cxx b/sc/source/filter/oox/worksheethelper.cxx
index a5fc023f8a99..40a99cdb444b 100644
--- a/sc/source/filter/oox/worksheethelper.cxx
+++ b/sc/source/filter/oox/worksheethelper.cxx
@@ -1034,7 +1034,7 @@ OUString WorksheetGlobals::getHyperlinkUrl( const HyperlinkModel& rHyperlink ) c
                 if ((aRange.ParseAny( aUrl.copy( nSepPos + 1 ), rDoc.getDoc(),
                                 formula::FormulaGrammar::CONV_XL_R1C1)
                       & ScRefFlags::VALID) == ScRefFlags::ZERO)
-                    aUrl = aUrl.replaceAt( nSepPos, 1, OUString( '.' ) );
+                    aUrl = aUrl.replaceAt( nSepPos, 1, rtl::OUStringChar( '.' ) );
             }
             // #i66592# convert sheet names that have been renamed on import
             OUString aSheetName = aUrl.copy( 1, nSepPos - 1 );
diff --git a/sc/source/ui/Accessibility/AccessibleCell.cxx b/sc/source/ui/Accessibility/AccessibleCell.cxx
index ed1dbd8ebeda..654dfe84ef67 100644
--- a/sc/source/ui/Accessibility/AccessibleCell.cxx
+++ b/sc/source/ui/Accessibility/AccessibleCell.cxx
@@ -457,7 +457,7 @@ void ScAccessibleCell::AddRelation(const ScRange& rRange,
     pRelationSet->AddRelation(aRelation);
 }
 
-static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view replacedChar, const OUString& replaceStr)
+static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view replacedChar, std::u16string_view replaceStr)
 {
     int iReplace = oldOUString.lastIndexOf(replacedChar);
     OUString aRet = oldOUString;
@@ -471,11 +471,11 @@ static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view
 
 static OUString ReplaceFourChar(const OUString& oldOUString)
 {
-    OUString aRet = ReplaceOneChar(oldOUString, u"\\", "\\\\");
-    aRet = ReplaceOneChar(aRet, u";", "\\;");
-    aRet = ReplaceOneChar(aRet, u"=", "\\=");
-    aRet = ReplaceOneChar(aRet, u",", "\\,");
-    aRet = ReplaceOneChar(aRet, u":", "\\:");
+    OUString aRet = ReplaceOneChar(oldOUString, u"\\", u"\\\\");
+    aRet = ReplaceOneChar(aRet, u";", u"\\;");
+    aRet = ReplaceOneChar(aRet, u"=", u"\\=");
+    aRet = ReplaceOneChar(aRet, u",", u"\\,");
+    aRet = ReplaceOneChar(aRet, u":", u"\\:");
     return aRet;
 }
 
diff --git a/sc/source/ui/app/inputhdl.cxx b/sc/source/ui/app/inputhdl.cxx
index 8c06ebfcc111..6466c30576f0 100644
--- a/sc/source/ui/app/inputhdl.cxx
+++ b/sc/source/ui/app/inputhdl.cxx
@@ -362,10 +362,10 @@ void ScInputHandler::InitRangeFinder( const OUString& rFormula )
 
     sal_Int32 nColon = aDelimiters.indexOf( ':' );
     if ( nColon != -1 )
-        aDelimiters = aDelimiters.replaceAt( nColon, 1, ""); // Delimiter without colon
+        aDelimiters = aDelimiters.replaceAt( nColon, 1, u""); // Delimiter without colon
     sal_Int32 nDot = aDelimiters.indexOf(cSheetSep);
     if ( nDot != -1 )
-        aDelimiters = aDelimiters.replaceAt( nDot, 1 , ""); // Delimiter without dot
+        aDelimiters = aDelimiters.replaceAt( nDot, 1 , u""); // Delimiter without dot
 
     const sal_Unicode* pChar = rFormula.getStr();
     sal_Int32 nLen = rFormula.getLength();
diff --git a/sc/source/ui/docshell/docsh4.cxx b/sc/source/ui/docshell/docsh4.cxx
index 289c66f756d9..a97a47ecc6ec 100644
--- a/sc/source/ui/docshell/docsh4.cxx
+++ b/sc/source/ui/docshell/docsh4.cxx
@@ -1213,7 +1213,7 @@ void ScDocShell::Execute( SfxRequest& rReq )
                 }
                 else if ( (nPos = aLangText.indexOf(aDocLangPrefix)) != -1 )
                 {
-                    aLangText = aLangText.replaceAt(nPos, aDocLangPrefix.getLength(), "");
+                    aLangText = aLangText.replaceAt(nPos, aDocLangPrefix.getLength(), u"");
 
                     if ( aLangText == "LANGUAGE_NONE" )
                     {
@@ -1243,12 +1243,12 @@ void ScDocShell::Execute( SfxRequest& rReq )
                 else if (-1 != (nPos = aLangText.indexOf( aSelectionLangPrefix )))
                 {
                     bSelection = true;
-                    aLangText = aLangText.replaceAt( nPos, aSelectionLangPrefix.getLength(), "" );
+                    aLangText = aLangText.replaceAt( nPos, aSelectionLangPrefix.getLength(), u"" );
                 }
                 else if (-1 != (nPos = aLangText.indexOf( aParagraphLangPrefix )))
                 {
                     bParagraph = true;
-                    aLangText = aLangText.replaceAt( nPos, aParagraphLangPrefix.getLength(), "" );
+                    aLangText = aLangText.replaceAt( nPos, aParagraphLangPrefix.getLength(), u"" );
                 }
 
                 if (bSelection || bParagraph)
@@ -1345,7 +1345,7 @@ void ScDocShell::Execute( SfxRequest& rReq )
             sal_Int32 nPos = 0;
             if(-1 != (nPos = sApplyText.indexOf( sSpellingRule )))
             {
-                sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), "");
+                sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), u"");
                 pEditView->InsertText( sApplyText );
             }
         }
diff --git a/sc/source/ui/docshell/impex.cxx b/sc/source/ui/docshell/impex.cxx
index 72dad3cc6410..5d8e755c18f6 100644
--- a/sc/source/ui/docshell/impex.cxx
+++ b/sc/source/ui/docshell/impex.cxx
@@ -890,7 +890,7 @@ static void lcl_DoubleEscapeChar( OUString& rString, sal_Unicode cStr )
     sal_Int32 n = 0;
     while( ( n = rString.indexOf( cStr, n ) ) != -1 )
     {
-        rString = rString.replaceAt( n, 0, OUString(cStr) );
+        rString = rString.replaceAt( n, 0, rtl::OUStringChar(cStr) );
         n += 2;
     }
 }
diff --git a/sc/source/ui/miscdlgs/acredlin.cxx b/sc/source/ui/miscdlgs/acredlin.cxx
index 554bf801d1de..1d0ab68a3313 100644
--- a/sc/source/ui/miscdlgs/acredlin.cxx
+++ b/sc/source/ui/miscdlgs/acredlin.cxx
@@ -1680,7 +1680,7 @@ namespace
                 {
                     // cut out alignment string
                     aStr = rExtraString.copy(nPos, n2 - nPos + 1);
-                    rExtraString = rExtraString.replaceAt(nPos, n2 - nPos + 1, "");
+                    rExtraString = rExtraString.replaceAt(nPos, n2 - nPos + 1, u"");
                     aStr = aStr.copy( n1-nPos+1 );
                 }
             }
diff --git a/sc/source/ui/navipi/content.cxx b/sc/source/ui/navipi/content.cxx
index c19c6b87a6fd..1b30df7f2406 100644
--- a/sc/source/ui/navipi/content.cxx
+++ b/sc/source/ui/navipi/content.cxx
@@ -943,7 +943,7 @@ static OUString lcl_NoteString( const ScPostIt& rNote )
     OUString aText = rNote.GetText();
     sal_Int32 nAt;
     while ( (nAt = aText.indexOf( '\n' )) != -1 )
-        aText = aText.replaceAt( nAt, 1, " " );
+        aText = aText.replaceAt( nAt, 1, u" " );
     return aText;
 }
 
diff --git a/sc/source/ui/unoobj/addruno.cxx b/sc/source/ui/unoobj/addruno.cxx
index 0e307071d9ef..520f110a6f5d 100644
--- a/sc/source/ui/unoobj/addruno.cxx
+++ b/sc/source/ui/unoobj/addruno.cxx
@@ -196,7 +196,7 @@ void SAL_CALL ScAddressConversionObj::setPropertyValue( const OUString& aPropert
                 sal_Int32 nColon = aUIString.lastIndexOf( ':' );
                 if ( nColon >= 0 && nColon < aUIString.getLength() - 1 &&
                      aUIString[nColon+1] == '.' )
-                    aUIString = aUIString.replaceAt( nColon+1, 1, "" );
+                    aUIString = aUIString.replaceAt( nColon+1, 1, u"" );
             }
 
             //  parse the rest like a UI string
diff --git a/sc/source/ui/unoobj/chart2uno.cxx b/sc/source/ui/unoobj/chart2uno.cxx
index 6ec3a1e633d1..40e72bbfc8d9 100644
--- a/sc/source/ui/unoobj/chart2uno.cxx
+++ b/sc/source/ui/unoobj/chart2uno.cxx
@@ -2261,7 +2261,7 @@ OUString SAL_CALL ScChart2DataProvider::convertRangeFromXML( const OUString& sXM
                 sal_Int32 nIndex = ScRangeStringConverter::IndexOf( sToken, ':', 0 );
                 if ( nIndex >= 0 && nIndex < aUIString.getLength() - 1 &&
                         aUIString[nIndex + 1] == '.' )
-                    aUIString = aUIString.replaceAt( nIndex + 1, 1, "" );
+                    aUIString = aUIString.replaceAt( nIndex + 1, 1, u"" );
 
                 if ( aUIString[0] == '.' )
                     aUIString = aUIString.copy( 1 );
diff --git a/sc/source/ui/view/output2.cxx b/sc/source/ui/view/output2.cxx
index 7c8758bb75e1..ba4a1b13a795 100644
--- a/sc/source/ui/view/output2.cxx
+++ b/sc/source/ui/view/output2.cxx
@@ -536,7 +536,7 @@ bool ScDrawStringsVars::SetText( const ScRefCellValue& rCell )
                     {
                         nRepeatChar = aString[ nRepeatPos + 1 ];
                         // delete placeholder and char to repeat
-                        aString = aString.replaceAt( nRepeatPos, 2, "" );
+                        aString = aString.replaceAt( nRepeatPos, 2, u"" );
                         // Do not cache/reuse a repeat-filled string, column
                         // widths or fonts or sizes may differ.
                         maLastCell.clear();
diff --git a/sc/source/ui/view/viewfunc.cxx b/sc/source/ui/view/viewfunc.cxx
index 339c70d30aac..af151534c018 100644
--- a/sc/source/ui/view/viewfunc.cxx
+++ b/sc/source/ui/view/viewfunc.cxx
@@ -383,7 +383,7 @@ void ScViewFunc::EnterData( SCCOL nCol, SCROW nRow, SCTAB nTab,
             {
                 ++nIndex;
             }
-            OUString aString = rString.replaceAt( 1, nIndex - 1, "" );
+            OUString aString = rString.replaceAt( 1, nIndex - 1, u"" );
 
             // if the remaining part without the leading '+' or '-' character
             // is non-empty and not a number, handle as formula
@@ -2745,7 +2745,7 @@ void ScViewFunc::ChangeNumFmtDecimals( bool bIncrement )
           for ( sal_Int32 i=1 ; i<sExponentialStandardFormat.getLength() ; i++ )
           {
             if ( sExponentialStandardFormat[i] >= '1' && sExponentialStandardFormat[i] <= '9' )
-              sExponentialStandardFormat = sExponentialStandardFormat.replaceAt( i, 1, "0" );
+              sExponentialStandardFormat = sExponentialStandardFormat.replaceAt( i, 1, u"0" );
           }
           aOut = aOut.copy( 0, nIndexE ); // remove exponential part
         }
diff --git a/sd/source/core/drawdoc2.cxx b/sd/source/core/drawdoc2.cxx
index 2f6fbfaccb47..c17910d686e3 100644
--- a/sd/source/core/drawdoc2.cxx
+++ b/sd/source/core/drawdoc2.cxx
@@ -286,7 +286,7 @@ void SdDrawDocument::UpdatePageRelativeURLs(const OUString& rOldName, std::u16st
                 {
                     if (aURL.getLength() == rOldName.getLength() + 1) // standard page name
                     {
-                        aURL = aURL.replaceAt(1, aURL.getLength() - 1, "") +
+                        aURL = aURL.replaceAt(1, aURL.getLength() - 1, u"") +
                             rNewName;
                         pURLField->SetURL(aURL);
                     }
@@ -296,7 +296,7 @@ void SdDrawDocument::UpdatePageRelativeURLs(const OUString& rOldName, std::u16st
                         if (aURL.getLength() == rOldName.getLength() + 2 + sNotes.getLength()
                             && aURL.indexOf(sNotes, rOldName.getLength() + 2) == rOldName.getLength() + 2)
                         {
-                            aURL = aURL.replaceAt(1, aURL.getLength() - 1, "") +
+                            aURL = aURL.replaceAt(1, aURL.getLength() - 1, u"") +
                                 rNewName + " " + sNotes;
                             pURLField->SetURL(aURL);
                         }
@@ -333,7 +333,7 @@ void SdDrawDocument::UpdatePageRelativeURLs(SdPage const * pPage, sal_uInt16 nPo
                         OUString aURLCopy = aURL;
                         const OUString sNotes(SdResId(STR_NOTES));
 
-                        aURLCopy = aURLCopy.replaceAt(0, aHashSlide.getLength(), "");
+                        aURLCopy = aURLCopy.replaceAt(0, aHashSlide.getLength(), u"");
 
                         bool bNotesLink = ( aURLCopy.getLength() >= sNotes.getLength() + 3
                             && aURLCopy.endsWith(sNotes) );
@@ -342,7 +342,7 @@ void SdDrawDocument::UpdatePageRelativeURLs(SdPage const * pPage, sal_uInt16 nPo
                             continue; // no compatible link and page
 
                         if (bNotes)
-                            aURLCopy = aURLCopy.replaceAt(aURLCopy.getLength() - sNotes.getLength(), sNotes.getLength(), "");
+                            aURLCopy = aURLCopy.replaceAt(aURLCopy.getLength() - sNotes.getLength(), sNotes.getLength(), u"");
 
                         sal_Int32 number = aURLCopy.toInt32();
                         sal_uInt16 realPageNumber = (nPos + 1)/ 2;
@@ -351,7 +351,7 @@ void SdDrawDocument::UpdatePageRelativeURLs(SdPage const * pPage, sal_uInt16 nPo
                         {
                             // update link page number
                             number += nIncrement;
-                            aURL = aURL.replaceAt(aHashSlide.getLength() + 1, aURL.getLength() - aHashSlide.getLength() - 1, "") +
+                            aURL = aURL.replaceAt(aHashSlide.getLength() + 1, aURL.getLength() - aHashSlide.getLength() - 1, u"") +
                                 OUString::number(number);
                             if (bNotes)
                             {
diff --git a/sd/source/filter/eppt/pptx-epptooxml.cxx b/sd/source/filter/eppt/pptx-epptooxml.cxx
index ec7a16e045e9..59f2e879b06f 100644
--- a/sd/source/filter/eppt/pptx-epptooxml.cxx
+++ b/sd/source/filter/eppt/pptx-epptooxml.cxx
@@ -2266,7 +2266,7 @@ void PowerPointExport::embedEffectAudio(const FSHelperPtr& pFS, const OUString&
     sRelId = addRelation(pFS->getOutputStream(),
                         oox::getRelationship(Relationship::AUDIO), sPath);
 
-    uno::Reference<io::XOutputStream> xOutputStream = openFragmentStream(sPath.replaceAt(0, 2, "/ppt"),
+    uno::Reference<io::XOutputStream> xOutputStream = openFragmentStream(sPath.replaceAt(0, 2, u"/ppt"),
             "audio/x-wav");
 
     comphelper::OStorageHelper::CopyInputToOutput(xAudioStream, xOutputStream);
diff --git a/sd/source/ui/dlg/custsdlg.cxx b/sd/source/ui/dlg/custsdlg.cxx
index fc8e774d82e9..78274f3f4492 100644
--- a/sd/source/ui/dlg/custsdlg.cxx
+++ b/sd/source/ui/dlg/custsdlg.cxx
@@ -199,7 +199,7 @@ void SdCustomShowDlg::SelectHdl(void const *p)
 
                     const CharClass* pCharClass = rDoc.GetCharClass();
                     while( pCharClass->isDigit( aStr, nStrPos ) )
-                        aStr = aStr.replaceAt( nStrPos, 1, "" );
+                        aStr = aStr.replaceAt( nStrPos, 1, u"" );
                     aStr = aStr.subView( 0, nStrPos) + OUString::number( ++nNum ) + aStr.subView( nStrPos);
                 }
 
diff --git a/sd/source/ui/docshell/docshel3.cxx b/sd/source/ui/docshell/docshel3.cxx
index b3c142d06750..5ed24657d9f1 100644
--- a/sd/source/ui/docshell/docshel3.cxx
+++ b/sd/source/ui/docshell/docshel3.cxx
@@ -308,7 +308,7 @@ void DrawDocShell::Execute( SfxRequest& rReq )
                         sal_Int32 nPos = -1;
                         if (-1 != (nPos = aNewLangTxt.indexOf( aDocumentLangPrefix )))
                         {
-                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aDocumentLangPrefix.getLength(), "" );
+                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aDocumentLangPrefix.getLength(), u"" );
 
                             if (aNewLangTxt == "LANGUAGE_NONE")
                                 lcl_setLanguage( pDoc, u"", true );
@@ -320,12 +320,12 @@ void DrawDocShell::Execute( SfxRequest& rReq )
                         else if (-1 != (nPos = aNewLangTxt.indexOf( aSelectionLangPrefix )))
                         {
                             bSelection = true;
-                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aSelectionLangPrefix.getLength(), "" );
+                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aSelectionLangPrefix.getLength(), u"" );
                         }
                         else if (-1 != (nPos = aNewLangTxt.indexOf( aParagraphLangPrefix )))
                         {
                             bParagraph = true;
-                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aParagraphLangPrefix.getLength(), "" );
+                            aNewLangTxt = aNewLangTxt.replaceAt( nPos, aParagraphLangPrefix.getLength(), u"" );
                         }
 
                         if (bSelection || bParagraph)
@@ -410,7 +410,7 @@ void DrawDocShell::Execute( SfxRequest& rReq )
             sal_Int32 nPos = 0;
             if(-1 != (nPos = sApplyText.indexOf( sSpellingRule )))
             {
-                sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), "");
+                sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), u"");
                 rEditView.InsertText( sApplyText );
             }
         }
diff --git a/sdext/source/minimizer/informationdialog.cxx b/sdext/source/minimizer/informationdialog.cxx
index 4f823eaee75d..0797e78560cf 100644
--- a/sdext/source/minimizer/informationdialog.cxx
+++ b/sdext/source/minimizer/informationdialog.cxx
@@ -264,7 +264,7 @@ void InformationDialog::InitDialog()
         aTitle = xURLTransformer->getPresentation( aPresentationURL, false );
 
         if ( aTitle.match( sFileProtocol ) )
-            aTitle = aTitle.replaceAt( 0, sFileProtocol.getLength(), OUString() );
+            aTitle = aTitle.replaceAt( 0, sFileProtocol.getLength(), u"" );
     }
 
     OUString aInfoString( getString( eInfoString ) );
diff --git a/sfx2/source/appl/childwin.cxx b/sfx2/source/appl/childwin.cxx
index 09e97f6de3da..263f750f9b12 100644
--- a/sfx2/source/appl/childwin.cxx
+++ b/sfx2/source/appl/childwin.cxx
@@ -405,7 +405,7 @@ void SfxChildWindow::InitializeChildWinFactory_Impl(sal_uInt16 nId, SfxChildWinI
     {
         // there is extra information
         rInfo.nFlags = static_cast<SfxChildWindowFlags>(static_cast<sal_uInt16>(aWinData.copy( nPos+1, nNextPos - nPos - 1 ).toInt32()));
-        aWinData = aWinData.replaceAt( nPos, nNextPos-nPos+1, "" );
+        aWinData = aWinData.replaceAt( nPos, nNextPos-nPos+1, u"" );
         rInfo.aExtraString = aWinData;
     }
     else
@@ -471,7 +471,7 @@ bool SfxChildWinInfo::GetExtraData_Impl
         {
             // Cut out Alignment string
             aStr = aExtraString.copy(nPos, n2 - nPos + 1);
-            aStr = aStr.replaceAt(nPos, n1-nPos+1, "");
+            aStr = aStr.replaceAt(nPos, n1-nPos+1, u"");
         }
     }
 
diff --git a/sfx2/source/dialog/dockwin.cxx b/sfx2/source/dialog/dockwin.cxx
index eb419d7c1656..e19949b279f8 100644
--- a/sfx2/source/dialog/dockwin.cxx
+++ b/sfx2/source/dialog/dockwin.cxx
@@ -815,8 +815,8 @@ void SfxDockingWindow::Initialize(SfxChildWinInfo *pInfo)
                 {
                     // extract alignment information from extrastring
                     aStr = pInfo->aExtraString.copy(nPos, n2 - nPos + 1);
-                    pInfo->aExtraString = pInfo->aExtraString.replaceAt(nPos, n2 - nPos + 1, "");
-                    aStr = aStr.replaceAt(nPos, n1-nPos+1, "");
+                    pInfo->aExtraString = pInfo->aExtraString.replaceAt(nPos, n2 - nPos + 1, u"");
+                    aStr = aStr.replaceAt(nPos, n1-nPos+1, u"");
                 }
             }
         }
diff --git a/sfx2/source/dialog/filedlghelper.cxx b/sfx2/source/dialog/filedlghelper.cxx
index 918b9c1869b7..60fb167c359a 100644
--- a/sfx2/source/dialog/filedlghelper.cxx
+++ b/sfx2/source/dialog/filedlghelper.cxx
@@ -1949,7 +1949,7 @@ void FileDialogHelper_Impl::addGraphicFilter()
 constexpr OUStringLiteral GRF_CONFIG_STR = u"   ";
 constexpr OUStringLiteral STD_CONFIG_STR = u"1 ";
 
-static void SetToken( OUString& rOrigStr, sal_Int32 nToken, sal_Unicode cTok, const OUString& rStr)
+static void SetToken( OUString& rOrigStr, sal_Int32 nToken, sal_Unicode cTok, std::u16string_view rStr)
 {
     const sal_Unicode*  pStr        = rOrigStr.getStr();
     sal_Int32     nLen              = rOrigStr.getLength();
diff --git a/sfx2/source/doc/doctemplates.cxx b/sfx2/source/doc/doctemplates.cxx
index 41aff2bd93c7..f2e13da357e2 100644
--- a/sfx2/source/doc/doctemplates.cxx
+++ b/sfx2/source/doc/doctemplates.cxx
@@ -560,7 +560,7 @@ void SfxDocTplService_Impl::getDirList()
             if (nIndex<0)
                 continue;
 
-            rTemplateDir = rTemplateDir.replaceAt(nIndex, aPrefix.getLength(), OUString());
+            rTemplateDir = rTemplateDir.replaceAt(nIndex, aPrefix.getLength(), u"");
             rTemplateDir = xExpander->expandMacros( rTemplateDir );
         }
     }
diff --git a/sfx2/source/doc/new.cxx b/sfx2/source/doc/new.cxx
index 2de3a680bd4d..37edc065bd88 100644
--- a/sfx2/source/doc/new.cxx
+++ b/sfx2/source/doc/new.cxx
@@ -174,7 +174,7 @@ IMPL_LINK( SfxNewFileDialog, RegionSelect, weld::TreeView&, rBox, void )
     OUString aSel = m_xRegionLb->get_selected_text();
     sal_Int32 nc = aSel.indexOf('(');
     if (nc != -1 && nc != 0)
-        aSel = aSel.replaceAt(nc-1, 1, "");
+        aSel = aSel.replaceAt(nc-1, 1, u"");
     if ( aSel.compareToIgnoreAsciiCase( SfxResId(STR_STANDARD) ) == 0 )
         m_xTemplateLb->append_text(SfxResId(STR_NONE));
     for (sal_uInt16 i = 0; i < nCount; ++i)
@@ -221,7 +221,7 @@ sal_uInt16  SfxNewFileDialog::GetSelectedTemplatePos() const
     OUString aSel = m_xRegionLb->get_selected_text();
     sal_Int32 nc = aSel.indexOf('(');
     if (nc != -1 && nc != 0)
-        aSel = aSel.replaceAt(nc-1, 1, "");
+        aSel = aSel.replaceAt(nc-1, 1, u"");
     if ( aSel.compareToIgnoreAsciiCase(SfxResId(STR_STANDARD)) != 0 )
         nEntry++;
     return nEntry;
diff --git a/shell/source/win32/spsupp/spsuppHelper.cxx b/shell/source/win32/spsupp/spsuppHelper.cxx
index 595128ca7479..b5f6514decd6 100644
--- a/shell/source/win32/spsupp/spsuppHelper.cxx
+++ b/shell/source/win32/spsupp/spsuppHelper.cxx
@@ -50,7 +50,7 @@ OUString GetString(TranslateId pResId)
         OUString sPath = GetSofficeExe();
         if (const sal_Int32 nDotPos = sPath.lastIndexOf('.'); nDotPos >= 0)
         {
-            sPath = sPath.replaceAt(nDotPos, sPath.getLength() - nDotPos, SAL_CONFIGFILE(""));
+            sPath = sPath.replaceAt(nDotPos, sPath.getLength() - nDotPos, SAL_CONFIGFILE(u""));
             if (osl::FileBase::getFileURLFromSystemPath(sPath, sPath) == osl::FileBase::E_None)
                 rtl::Bootstrap::setIniFilename(sPath);
         }
diff --git a/starmath/source/view.cxx b/starmath/source/view.cxx
index cea9fff62b35..6eb1213071cb 100644
--- a/starmath/source/view.cxx
+++ b/starmath/source/view.cxx
@@ -1114,7 +1114,7 @@ Size SmViewShell::GetTextSize(OutputDevice const & rDevice, const OUString& rTex
                 }
 
                 aText = aLine.copy(0, m);
-                aLine = aLine.replaceAt(0, m, "");
+                aLine = aLine.replaceAt(0, m, u"");
                 aSize = GetTextLineSize(rDevice, aText);
                 aTextSize.AdjustHeight(aSize.Height() );
                 aTextSize.setWidth( std::clamp(aSize.Width(), aTextSize.Width(), MaxWidth) );
@@ -1194,7 +1194,7 @@ void SmViewShell::DrawText(OutputDevice& rDevice, const Point& rPosition, const
                     }
                 }
                 aText = aLine.copy(0, m);
-                aLine = aLine.replaceAt(0, m, "");
+                aLine = aLine.replaceAt(0, m, u"");
 
                 DrawTextLine(rDevice, aPoint, aText);
                 aPoint.AdjustY(aSize.Height() );
@@ -1781,7 +1781,7 @@ void SmViewShell::Execute(SfxRequest& rReq)
                             }
                             if ( bForceUTF16 )
                             {
-                                OUString aNewString = aString.replaceAt( nPosL,nPosU-nPosL,"UTF-16");
+                                OUString aNewString = aString.replaceAt( nPosL, nPosU-nPosL, u"UTF-16");
                                 pStrm.reset(new SvMemoryStream( const_cast<sal_Unicode *>(aNewString.getStr()), aNewString.getLength() * sizeof(sal_Unicode), StreamMode::READ));
                             }
                             else
diff --git a/svtools/source/svhtml/parhtml.cxx b/svtools/source/svhtml/parhtml.cxx
index 8c9d7909602f..6c3a2c070d2b 100644
--- a/svtools/source/svhtml/parhtml.cxx
+++ b/svtools/source/svhtml/parhtml.cxx
@@ -1168,7 +1168,7 @@ HtmlTokenId HTMLParser::GetNextToken_()
                         if ((nRet >= HtmlTokenId::ONOFF_START) && aToken.endsWith("/"))
                         {
                             mnPendingOffToken = static_cast<HtmlTokenId>(static_cast<int>(nRet) + 1);       // HtmlTokenId::<TOKEN>_ON -> HtmlTokenId::<TOKEN>_OFF
-                            aToken = aToken.replaceAt( aToken.getLength()-1, 1, "");   // remove trailing '/'
+                            aToken = aToken.replaceAt( aToken.getLength()-1, 1, u"");   // remove trailing '/'
                         }
                         if( sal_Unicode(EOF) == nNextCh && rInput.eof() )
                         {
@@ -1387,7 +1387,7 @@ void HTMLParser::UnescapeToken()
         bEscape = false;
         if( '\\'==aToken[nPos] && !bOldEscape )
         {
-            aToken = aToken.replaceAt( nPos, 1, "" );
+            aToken = aToken.replaceAt( nPos, 1, u"" );
             bEscape = true;
         }
         else
@@ -1477,7 +1477,7 @@ const HTMLOptions& HTMLParser::GetOptions( HtmlOptionId const *pNoConvertToken )
                             case '\r':
                             case '\n':
                                 if( bStripCRLF )
-                                    aToken = aToken.replaceAt( nPos, 1, "" );
+                                    aToken = aToken.replaceAt( nPos, 1, u"" );
                                 else
                                 {
                                     nPos++;
@@ -1492,7 +1492,7 @@ const HTMLOptions& HTMLParser::GetOptions( HtmlOptionId const *pNoConvertToken )
                                 }
                                 else
                                 {
-                                    aToken = aToken.replaceAt( nPos, 1, "" );
+                                    aToken = aToken.replaceAt( nPos, 1, u"" );
                                     bEscape = true;
                                 }
                                 break;
@@ -1549,7 +1549,7 @@ const HTMLOptions& HTMLParser::GetOptions( HtmlOptionId const *pNoConvertToken )
                                 }
                                 else
                                 {
-                                    aToken = aToken.replaceAt( nPos, 1, "" );
+                                    aToken = aToken.replaceAt( nPos, 1, u"" );
                                     bEscape = true;
                                 }
                                 break;
diff --git a/svx/source/dialog/fntctrl.cxx b/svx/source/dialog/fntctrl.cxx
index 929921af4c17..af3231432864 100644
--- a/svx/source/dialog/fntctrl.cxx
+++ b/svx/source/dialog/fntctrl.cxx
@@ -129,7 +129,7 @@ bool CleanAndCheckEmpty(OUString& rText)
     for (sal_Int32 i = 0; i < rText.getLength(); ++i)
     {
         if (0xa == rText[i] || 0xd == rText[i])
-            rText = rText.replaceAt(i, 1, " ");
+            rText = rText.replaceAt(i, 1, u" ");
         else
             bEmpty = false;
     }
diff --git a/svx/source/fmcomp/gridcell.cxx b/svx/source/fmcomp/gridcell.cxx
index a513784d35f9..c99547c8c8fc 100644
--- a/svx/source/fmcomp/gridcell.cxx
+++ b/svx/source/fmcomp/gridcell.cxx
@@ -1179,7 +1179,7 @@ void DbTextField::updateFromModel( Reference< XPropertySet > _rxModel )
     if (nMaxTextLen != 0 && sText.getLength() > nMaxTextLen)
     {
         sal_Int32 nDiff = sText.getLength() - nMaxTextLen;
-        sText = sText.replaceAt(sText.getLength() - nDiff,nDiff, OUString());
+        sText = sText.replaceAt(sText.getLength() - nDiff,nDiff, u"");
     }
 
 
diff --git a/svx/source/svdraw/svdobj.cxx b/svx/source/svdraw/svdobj.cxx
index 957ea2e38ebc..51f65f76755f 100644
--- a/svx/source/svdraw/svdobj.cxx
+++ b/svx/source/svdraw/svdobj.cxx
@@ -1108,7 +1108,7 @@ OUString SdrObject::ImpGetDescriptionStr(TranslateId pStrCacheID) const
     nPos = aStr.indexOf("%2");
     if (nPos >= 0)
         // Replace '%2' with the passed value.
-        aStr = aStr.replaceAt(nPos, 2, "0");
+        aStr = aStr.replaceAt(nPos, 2, u"0");
     return aStr;
 }
 
diff --git a/sw/source/core/access/acccell.cxx b/sw/source/core/access/acccell.cxx
index d79f4eb5caef..419206c56f00 100644
--- a/sw/source/core/access/acccell.cxx
+++ b/sw/source/core/access/acccell.cxx
@@ -370,7 +370,7 @@ uno::Any SwAccessibleCell::getMinimumIncrement(  )
     return uno::Any();
 }
 
-static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view replacedChar, const OUString& replaceStr)
+static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view replacedChar, std::u16string_view replaceStr)
 {
     int iReplace = oldOUString.lastIndexOf(replacedChar);
     OUString aRet = oldOUString;
@@ -384,11 +384,11 @@ static OUString ReplaceOneChar(const OUString& oldOUString, std::u16string_view
 
 static OUString ReplaceFourChar(const OUString& oldOUString)
 {
-    OUString aRet = ReplaceOneChar(oldOUString,u"\\","\\\\");
-    aRet = ReplaceOneChar(aRet,u";","\\;");
-    aRet = ReplaceOneChar(aRet,u"=","\\=");
-    aRet = ReplaceOneChar(aRet,u",","\\,");
-    aRet = ReplaceOneChar(aRet,u":","\\:");
+    OUString aRet = ReplaceOneChar(oldOUString, u"\\", u"\\\\");
+    aRet = ReplaceOneChar(aRet, u";", u"\\;");
+    aRet = ReplaceOneChar(aRet, u"=", u"\\=");
+    aRet = ReplaceOneChar(aRet, u",", u"\\,");
+    aRet = ReplaceOneChar(aRet, u":", u"\\:");
     return aRet;
 }
 
diff --git a/sw/source/core/crsr/swcrsr.cxx b/sw/source/core/crsr/swcrsr.cxx
index 6f4ed5f01ed0..c5061c42f854 100644
--- a/sw/source/core/crsr/swcrsr.cxx
+++ b/sw/source/core/crsr/swcrsr.cxx
@@ -1546,7 +1546,7 @@ static OUString lcl_MaskDeletedRedlines( const SwTextNode* pTextNd )
                     pRed->CalcStartEnd( pTextNd->GetIndex(), nStart, nEnd );
 
                     while ( nStart < nEnd && nStart < sNodeText.getLength() )
-                        sNodeText = sNodeText.replaceAt( nStart++, 1, OUString(CH_TXTATR_INWORD) );
+                        sNodeText = sNodeText.replaceAt( nStart++, 1, rtl::OUStringChar(CH_TXTATR_INWORD) );
                 }
             }
         }
diff --git a/sw/source/core/edit/autofmt.cxx b/sw/source/core/edit/autofmt.cxx
index 27b6b1c79108..6df314ae55c2 100644
--- a/sw/source/core/edit/autofmt.cxx
+++ b/sw/source/core/edit/autofmt.cxx
@@ -853,7 +853,7 @@ SwAutoFormat::GetDigitLevel(const SwTextFrame& rFrame, TextFrameIndex& rPos,
 
                 eScan = (eScan & ~(UPPER_ALPHA|LOWER_ALPHA)) | eTmpScan;
                 if( pNumTypes )
-                    (*pNumTypes) = pNumTypes->replaceAt( pNumTypes->getLength() - 1, 1, OUString(c) );
+                    (*pNumTypes) = pNumTypes->replaceAt( pNumTypes->getLength() - 1, 1, rtl::OUStringChar(c) );
             }
 
             if( eScan & DELIM )
diff --git a/sw/source/core/fields/expfld.cxx b/sw/source/core/fields/expfld.cxx
index 44c589060feb..ee4cfc5c3460 100644
--- a/sw/source/core/fields/expfld.cxx
+++ b/sw/source/core/fields/expfld.cxx
@@ -112,7 +112,7 @@ OUString ReplacePoint( const OUString& rTmpName, bool bWithCommandType )
         return rTmpName;
     }
 
-    OUString sRes = rTmpName.replaceAt(nIndex, 1, OUString(DB_DELIM));
+    OUString sRes = rTmpName.replaceAt(nIndex, 1, rtl::OUStringChar(DB_DELIM));
 
     if (bWithCommandType)
     {
@@ -121,13 +121,13 @@ OUString ReplacePoint( const OUString& rTmpName, bool bWithCommandType )
         {
             return sRes;
         }
-        sRes = sRes.replaceAt(nIndex, 1, OUString(DB_DELIM));
+        sRes = sRes.replaceAt(nIndex, 1, rtl::OUStringChar(DB_DELIM));
     }
 
     nIndex = sRes.indexOf('.');
     if (nIndex>=0)
     {
-        sRes = sRes.replaceAt(nIndex, 1, OUString(DB_DELIM));
+        sRes = sRes.replaceAt(nIndex, 1, rtl::OUStringChar(DB_DELIM));
     }
     return sRes;
 }
diff --git a/sw/source/core/table/swtable.cxx b/sw/source/core/table/swtable.cxx
index da6255a73770..a272642125da 100644
--- a/sw/source/core/table/swtable.cxx
+++ b/sw/source/core/table/swtable.cxx
@@ -101,10 +101,10 @@ static OUString& lcl_TabToBlankAtSttEnd( OUString& rText )
 
     for( n = 0; n < rText.getLength() && ' ' >= ( c = rText[n] ); ++n )
         if( '\x9' == c )
-            rText = rText.replaceAt( n, 1, " " );
+            rText = rText.replaceAt( n, 1, u" " );
     for( n = rText.getLength(); n && ' ' >= ( c = rText[--n] ); )
         if( '\x9' == c )
-            rText = rText.replaceAt( n, 1, " " );
+            rText = rText.replaceAt( n, 1, u" " );
     return rText;
 }
 
diff --git a/sw/source/core/text/porfld.cxx b/sw/source/core/text/porfld.cxx
index 7c9aba47d74e..c366401c9153 100644
--- a/sw/source/core/text/porfld.cxx
+++ b/sw/source/core/text/porfld.cxx
@@ -68,7 +68,7 @@ void SwFieldPortion::TakeNextOffset( const SwFieldPortion* pField )
 {
     OSL_ENSURE( pField, "TakeNextOffset: Missing Source" );
     m_nNextOffset = pField->GetNextOffset();
-    m_aExpand = m_aExpand.replaceAt(0, sal_Int32(m_nNextOffset), "");
+    m_aExpand = m_aExpand.replaceAt(0, sal_Int32(m_nNextOffset), u"");
     m_bFollow = true;
 }
 
diff --git a/sw/source/core/txtnode/fntcache.cxx b/sw/source/core/txtnode/fntcache.cxx
index ccc25f50df9c..f2c18d7b1ce9 100644
--- a/sw/source/core/txtnode/fntcache.cxx
+++ b/sw/source/core/txtnode/fntcache.cxx
@@ -1616,16 +1616,16 @@ void SwFntObj::DrawText( SwDrawTextInfo &rInf )
                     if ((i + nCopyStart + 1 >= sal_Int32(rInf.GetLen())) ||
                         aKernArray[i + nCopyStart] != aKernArray[ i + nCopyStart + 1])
                     {
-                        aBulletOverlay = aBulletOverlay.replaceAt(i, 1, OUString(CH_BULLET));
+                        aBulletOverlay = aBulletOverlay.replaceAt(i, 1, rtl::OUStringChar(CH_BULLET));
                     }
                     else
                     {
-                        aBulletOverlay = aBulletOverlay.replaceAt(i, 1, OUString(CH_BLANK));
+                        aBulletOverlay = aBulletOverlay.replaceAt(i, 1, rtl::OUStringChar(CH_BLANK));
                     }
                 }
                 else
                 {
-                    aBulletOverlay = aBulletOverlay.replaceAt(i, 1, OUString(CH_BLANK));
+                    aBulletOverlay = aBulletOverlay.replaceAt(i, 1, rtl::OUStringChar(CH_BLANK));
                 }
         }
 
@@ -2502,7 +2502,7 @@ TextFrameIndex SwFont::GetTextBreak(SwDrawTextInfo const & rInf, tools::Long nTe
                     // In this case, the beginning of aTmpText is wrong.
                     OUString aSnippetTmp(aSnippet.copy(0, 1));
                     aSnippetTmp = m_aSub[m_nActual].CalcCaseMap( aSnippetTmp );
-                    aTmpText = aTmpText.replaceAt( 0, aSnippetTmp.getLength(), OUString(aSnippet[0]) );
+                    aTmpText = aTmpText.replaceAt( 0, aSnippetTmp.getLength(), rtl::OUStringChar(aSnippet[0]) );
                 }
             }
 
diff --git a/sw/source/core/txtnode/modeltoviewhelper.cxx b/sw/source/core/txtnode/modeltoviewhelper.cxx
index cf4983192b23..c8c6095726cb 100644
--- a/sw/source/core/txtnode/modeltoviewhelper.cxx
+++ b/sw/source/core/txtnode/modeltoviewhelper.cxx
@@ -226,7 +226,7 @@ ModelToViewHelper::ModelToViewHelper(const SwTextNode &rNode,
             sal_Int32 const viewBlockPos(nBlockStart + nOffset);
             m_aMap.emplace_back(modelBlockPos, viewBlockPos, false);
 
-            m_aRetText = m_aRetText.replaceAt(nOffset + nBlockStart, nBlockLen, OUString());
+            m_aRetText = m_aRetText.replaceAt(nOffset + nBlockStart, nBlockLen, u"");
             nOffset -= nBlockLen;
         }
         else
diff --git a/sw/source/core/txtnode/ndtxt.cxx b/sw/source/core/txtnode/ndtxt.cxx
index 33509d405aad..5134d7672fa2 100644
--- a/sw/source/core/txtnode/ndtxt.cxx
+++ b/sw/source/core/txtnode/ndtxt.cxx
@@ -2392,8 +2392,8 @@ void SwTextNode::CutImpl( SwTextNode * const pDest, const SwIndex & rDestStart,
         abort();
     }
     pDest->m_Text = pDest->m_Text.replaceAt(nDestStart, 0,
-                        m_Text.copy(nTextStartIdx, nLen));
-    OUString const newText = m_Text.replaceAt(nTextStartIdx, nLen, "");
+                        m_Text.subView(nTextStartIdx, nLen));
+    OUString const newText = m_Text.replaceAt(nTextStartIdx, nLen, u"");
     nLen = pDest->m_Text.getLength() - nInitSize; // update w/ current size!
     if (!nLen)                 // String didn't grow?
         return;
@@ -2639,7 +2639,7 @@ void SwTextNode::EraseText(const SwIndex &rIdx, const sal_Int32 nCount,
                       ? m_Text.getLength() - nStartIdx : nCount;
     const sal_Int32 nEndIdx = nStartIdx + nCnt;
     if (nEndIdx <= m_Text.getLength())
-        m_Text = m_Text.replaceAt(nStartIdx, nCnt, "");
+        m_Text = m_Text.replaceAt(nStartIdx, nCnt, u"");
 
     // GCAttr(); don't remove all empty ones, just the ones that are in the
     // range but not at the end of the range.
@@ -3679,10 +3679,10 @@ void SwTextNode::ReplaceText( const SwIndex& rStart, const sal_Int32 nDelLen,
     {
         // Replace the 1st char, then delete the rest and insert.
         // This way the attributes of the 1st char are expanded!
-        m_Text = m_Text.replaceAt(nStartPos, 1, sInserted.copy(0, 1));
+        m_Text = m_Text.replaceAt(nStartPos, 1, sInserted.subView(0, 1));
 
         ++const_cast<SwIndex&>(rStart);
-        m_Text = m_Text.replaceAt(rStart.GetIndex(), nLen - 1, "");
+        m_Text = m_Text.replaceAt(rStart.GetIndex(), nLen - 1, u"");
         Update( rStart, nLen - 1, true );
 
         OUString aTmpText( sInserted.copy(1) );
@@ -3691,7 +3691,7 @@ void SwTextNode::ReplaceText( const SwIndex& rStart, const sal_Int32 nDelLen,
     }
     else
     {
-        m_Text = m_Text.replaceAt(nStartPos, nLen, "");
+        m_Text = m_Text.replaceAt(nStartPos, nLen, u"");
         Update( rStart, nLen, true );
 
         m_Text = m_Text.replaceAt(nStartPos, 0, sInserted);
diff --git a/sw/source/core/txtnode/thints.cxx b/sw/source/core/txtnode/thints.cxx
index e97df81267df..5aba3a2b6e64 100644
--- a/sw/source/core/txtnode/thints.cxx
+++ b/sw/source/core/txtnode/thints.cxx
@@ -1389,7 +1389,7 @@ bool SwTextNode::InsertHint( SwTextAttr * const pAttr, const SetAttrMode nMode )
                             // delete the char from the string
                             assert(CH_TXTATR_BREAKWORD == m_Text[pAttr->GetStart()]
                                 || CH_TXTATR_INWORD == m_Text[pAttr->GetStart()]);
-                            m_Text = m_Text.replaceAt(pAttr->GetStart(), 1, "");
+                            m_Text = m_Text.replaceAt(pAttr->GetStart(), 1, u"");
                             // Update SwIndexes
                             SwIndex aTmpIdx( this, pAttr->GetStart() );
                             Update( aTmpIdx, 1, true );
@@ -1420,7 +1420,7 @@ bool SwTextNode::InsertHint( SwTextAttr * const pAttr, const SetAttrMode nMode )
                         // delete the char from the string
                         assert(CH_TXTATR_BREAKWORD == m_Text[pAttr->GetStart()]
                             || CH_TXTATR_INWORD == m_Text[pAttr->GetStart()]);
-                        m_Text = m_Text.replaceAt(pAttr->GetStart(), 1, "");
+                        m_Text = m_Text.replaceAt(pAttr->GetStart(), 1, u"");
                         // Update SwIndexes
                         SwIndex aTmpIdx( this, pAttr->GetStart() );
                         Update( aTmpIdx, 1, true );
diff --git a/sw/source/core/undo/undel.cxx b/sw/source/core/undo/undel.cxx
index 88c8b2ed1f76..ed1cdf38794d 100644
--- a/sw/source/core/undo/undel.cxx
+++ b/sw/source/core/undo/undel.cxx
@@ -589,7 +589,7 @@ bool SwUndoDelete::CanGrouping( SwDoc& rDoc, const SwPaM& rDelPam )
         m_nEndContent++;    // Delete: attach char at the end
         nUChrPos++;
     }
-    m_aSttStr = m_aSttStr->replaceAt( nUChrPos, 0, OUString(cDelChar) );
+    m_aSttStr = m_aSttStr->replaceAt( nUChrPos, 0, rtl::OUStringChar(cDelChar) );
     pDelTextNd->EraseText( pStt->nContent, 1 );
 
     m_bGroup = true;
diff --git a/sw/source/core/unocore/unofield.cxx b/sw/source/core/unocore/unofield.cxx
index 729a2581075a..a09e6785c864 100644
--- a/sw/source/core/unocore/unofield.cxx
+++ b/sw/source/core/unocore/unofield.cxx
@@ -2568,10 +2568,10 @@ static OUString OldNameToNewName_Impl( const OUString &rOld )
     OUString sServiceNameCC( rOld );
     sal_Int32 nIdx = sServiceNameCC.indexOf( aOldNamePart1 );
     if (nIdx >= 0)
-        sServiceNameCC = sServiceNameCC.replaceAt( nIdx, strlen(aOldNamePart1), ".textfield.docinfo." );
+        sServiceNameCC = sServiceNameCC.replaceAt( nIdx, strlen(aOldNamePart1), u".textfield.docinfo." );
     nIdx = sServiceNameCC.indexOf( aOldNamePart2 );
     if (nIdx >= 0)
-        sServiceNameCC = sServiceNameCC.replaceAt( nIdx, strlen(aOldNamePart2), ".textfield." );
+        sServiceNameCC = sServiceNameCC.replaceAt( nIdx, strlen(aOldNamePart2), u".textfield." );
     return sServiceNameCC;
 }
 
diff --git a/sw/source/filter/html/css1atr.cxx b/sw/source/filter/html/css1atr.cxx
index 6618a5479165..de952e8552d8 100644
--- a/sw/source/filter/html/css1atr.cxx
+++ b/sw/source/filter/html/css1atr.cxx
@@ -886,7 +886,7 @@ sal_uInt16 SwHTMLWriter::GetCSS1Selector( const SwFormat *pFormat, OString& rTok
         sal_Int32 nPos = rClass.indexOf( '.' );
         if( nPos >= 0 && rClass.getLength() > nPos+1 )
         {
-            rClass = rClass.replaceAt( 0, nPos+1, "" );
+            rClass = rClass.replaceAt( 0, nPos+1, u"" );
         }
 
         rClass = GetAppCharClass().lowercase( rClass );
diff --git a/sw/source/filter/html/htmlflywriter.cxx b/sw/source/filter/html/htmlflywriter.cxx
index 73ab34c60616..2aee659fc6e8 100644
--- a/sw/source/filter/html/htmlflywriter.cxx
+++ b/sw/source/filter/html/htmlflywriter.cxx
@@ -2187,7 +2187,7 @@ void SwHTMLWriter::AddLinkTarget( const OUString& rURL )
         // Just remember it in a sorted array
         if( bEncoded )
         {
-            aURL = aURL.replaceAt( nPos - 1, 3, OUString(cMarkSeparator)  );
+            aURL = aURL.replaceAt( nPos - 1, 3, rtl::OUStringChar(cMarkSeparator)  );
         }
         m_aImplicitMarks.insert( aURL );
     }
@@ -2209,7 +2209,7 @@ void SwHTMLWriter::AddLinkTarget( const OUString& rURL )
             m_aOutlineMarkPoss.insert( m_aOutlineMarkPoss.begin()+nIns, nIdx );
             if( bEncoded )
             {
-                aURL = aURL.replaceAt( nPos - 1, 3, OUString(cMarkSeparator) );
+                aURL = aURL.replaceAt( nPos - 1, 3, rtl::OUStringChar(cMarkSeparator) );
             }
             m_aOutlineMarks.insert( m_aOutlineMarks.begin()+nIns, aURL );
         }
diff --git a/sw/source/filter/html/htmlform.cxx b/sw/source/filter/html/htmlform.cxx
index 94af6b26f7a1..60e6ea0f2924 100644
--- a/sw/source/filter/html/htmlform.cxx
+++ b/sw/source/filter/html/htmlform.cxx
@@ -2484,7 +2484,7 @@ void SwHTMLParser::InsertSelectText()
     {
         sal_Int32 nLen = rText.getLength();
         if( !nLen || ' '==rText[nLen-1])
-            aToken = aToken.replaceAt( 0, 1, "" );
+            aToken = aToken.replaceAt( 0, 1, u"" );
     }
     if( !aToken.isEmpty() )
         rText += aToken;
diff --git a/sw/source/filter/html/wrthtml.cxx b/sw/source/filter/html/wrthtml.cxx
index db4a0baad396..df4cef472ca2 100644
--- a/sw/source/filter/html/wrthtml.cxx
+++ b/sw/source/filter/html/wrthtml.cxx
@@ -672,13 +672,13 @@ static void lcl_html_OutSectionStartTag( SwHTMLWriter& rHTMLWrt,
             sal_Int32 nPos = aSection.indexOf( '%' );
             while( nPos != -1 )
             {
-                aSection = aSection.replaceAt(nPos, 1, "%25");
+                aSection = aSection.replaceAt(nPos, 1, u"%25");
                 nPos = aSection.indexOf( '%', nPos+3 );
             }
             nPos = aSection.indexOf( cDelim );
             while( nPos != -1 )
             {
-                aSection = aSection.replaceAt(nPos, 1, "%FF" );
+                aSection = aSection.replaceAt(nPos, 1, u"%FF" );
                 nPos = aSection.indexOf( cDelim, nPos+3 );
             }
             HTMLOutFuncs::Out_String( rHTMLWrt.Strm(), aSection,
diff --git a/sw/source/filter/ww8/writerwordglue.cxx b/sw/source/filter/ww8/writerwordglue.cxx
index 2e47db39fe5e..80fcb68c4e06 100644
--- a/sw/source/filter/ww8/writerwordglue.cxx
+++ b/sw/source/filter/ww8/writerwordglue.cxx
@@ -869,7 +869,7 @@ namespace sw
                     bool bIsCharA = ( nPos != -1 && IsNotAM( rParams, nPos ) );
                     bForceNatNum |= bIsCharA;
                     if ( bIsCharA )
-                        rParams = rParams.replaceAt( nPos, 1, "D" );
+                        rParams = rParams.replaceAt( nPos, 1, u"D" );
                     nLastPos = nPos;
                 } while ( -1 != nLastPos );
             }
@@ -898,7 +898,7 @@ namespace sw
                     if ( nDocLang == LANGUAGE_FRENCH )
                     {
                         if ( ( nChar == 'a' || nChar == 'A' ) && IsNotAM(rParams, nI) )
-                            rParams = rParams.replaceAt(nI, 1, "Y");
+                            rParams = rParams.replaceAt(nI, 1, u"Y");
                     }
                     if (nChar == '/')
                     {
@@ -906,7 +906,7 @@ namespace sw
                         // But not if it's a '/' inside AM/PM
                         if (!(IsPreviousAM(rParams, nI) && IsNextPM(rParams, nI)))
                         {
-                            rParams = rParams.replaceAt(nI, 1, "\\/");
+                            rParams = rParams.replaceAt(nI, 1, u"\\/");
                             nLen++;
                         }
                         nI++;
@@ -922,13 +922,13 @@ namespace sw
                         if ( rLang == LANGUAGE_FINNISH )
                         {
                             if (nChar == 'y' || nChar == 'Y')
-                                rParams = rParams.replaceAt(nI, 1, "V");
+                                rParams = rParams.replaceAt(nI, 1, u"V");
                             else if (nChar == 'm' || nChar == 'M')
-                                rParams = rParams.replaceAt(nI, 1, "K");
+                                rParams = rParams.replaceAt(nI, 1, u"K");
                             else if (nChar == 'd' || nChar == 'D')
-                                rParams = rParams.replaceAt(nI, 1, "P");
+                                rParams = rParams.replaceAt(nI, 1, u"P");
                             else if (nChar == 'h' || nChar == 'H')
-                                rParams = rParams.replaceAt(nI, 1, "T");
+                                rParams = rParams.replaceAt(nI, 1, u"T");
                         }
                         else if ( rLang.anyOf(
                             LANGUAGE_DANISH,
@@ -939,7 +939,7 @@ namespace sw
                             LANGUAGE_SWEDISH_FINLAND))
                         {
                             if (nChar == 'h' || nChar == 'H')
-                                rParams = rParams.replaceAt(nI, 1, "T");
+                                rParams = rParams.replaceAt(nI, 1, u"T");
                         }
                         else if ( rLang.anyOf(
                             LANGUAGE_PORTUGUESE,
@@ -966,31 +966,31 @@ namespace sw
                             LANGUAGE_SPANISH_PUERTO_RICO))
                         {
                             if (nChar == 'a' || nChar == 'A')
-                                rParams = rParams.replaceAt(nI, 1, "O");
+                                rParams = rParams.replaceAt(nI, 1, u"O");
                             else if (nChar == 'y' || nChar == 'Y')
-                                rParams = rParams.replaceAt(nI, 1, "A");
+                                rParams = rParams.replaceAt(nI, 1, u"A");
                         }
                         else if ( rLang.anyOf(
                             LANGUAGE_DUTCH,
                             LANGUAGE_DUTCH_BELGIAN))
                         {
                             if (nChar == 'y' || nChar == 'Y')
-                                rParams = rParams.replaceAt(nI, 1, "J");
+                                rParams = rParams.replaceAt(nI, 1, u"J");
                             else if (nChar == 'u' || nChar == 'U')
-                                rParams = rParams.replaceAt(nI, 1, "H");
+                                rParams = rParams.replaceAt(nI, 1, u"H");
                         }
                         else if ( rLang.anyOf(
                                 LANGUAGE_ITALIAN,
                                 LANGUAGE_ITALIAN_SWISS))
                         {
                             if (nChar == 'a' || nChar == 'A')
-                                rParams = rParams.replaceAt(nI, 1, "O");
+                                rParams = rParams.replaceAt(nI, 1, u"O");
                             else if (nChar == 'g' || nChar == 'G')
-                                rParams = rParams.replaceAt(nI, 1, "X");
+                                rParams = rParams.replaceAt(nI, 1, u"X");
                             else if (nChar == 'y' || nChar == 'Y')
-                                rParams = rParams.replaceAt(nI, 1, "A");
+                                rParams = rParams.replaceAt(nI, 1, u"A");
                             else if (nChar == 'd' || nChar == 'D')
-                                rParams = rParams.replaceAt(nI, 1, "G");
+                                rParams = rParams.replaceAt(nI, 1, u"G");
                         }
                         else if ( rLang.anyOf(
                             LANGUAGE_GERMAN,
@@ -1000,9 +1000,9 @@ namespace sw
                             LANGUAGE_GERMAN_LIECHTENSTEIN))
                         {
                             if (nChar == 'y' || nChar == 'Y')
-                                rParams = rParams.replaceAt(nI, 1, "J");
+                                rParams = rParams.replaceAt(nI, 1, u"J");
                             else if (nChar == 'd' || nChar == 'D')
-                                rParams = rParams.replaceAt(nI, 1, "T");
+                                rParams = rParams.replaceAt(nI, 1, u"T");
                         }
                         else if ( rLang.anyOf(
                             LANGUAGE_FRENCH,
@@ -1013,9 +1013,9 @@ namespace sw
                             LANGUAGE_FRENCH_MONACO))
                         {
                             if (nChar == 'y' || nChar == 'Y' || nChar == 'a')
-                                rParams = rParams.replaceAt(nI, 1, "A");
+                                rParams = rParams.replaceAt(nI, 1, u"A");
                             else if (nChar == 'd' || nChar == 'D' || nChar == 'j')
-                                rParams = rParams.replaceAt(nI, 1, "J");
+                                rParams = rParams.replaceAt(nI, 1, u"J");
                         }
                     }
                 }
@@ -1061,9 +1061,9 @@ namespace sw
                 if (!nI || rFormat[nI-1]!='\\')
                 {
                     if (rFormat[nI]=='\"')
-                        rFormat = rFormat.replaceAt(nI, 1, "\'");
+                        rFormat = rFormat.replaceAt(nI, 1, u"\'");
                     else if (rFormat[nI]=='\'')
-                        rFormat = rFormat.replaceAt(nI, 1, "\"");
+                        rFormat = rFormat.replaceAt(nI, 1, u"\"");
                 }
             }
         }
diff --git a/sw/source/filter/ww8/wrtw8num.cxx b/sw/source/filter/ww8/wrtw8num.cxx
index 857007872cea..4836678172e9 100644
--- a/sw/source/filter/ww8/wrtw8num.cxx
+++ b/sw/source/filter/ww8/wrtw8num.cxx
@@ -488,7 +488,7 @@ void MSWordExportBase::NumberingLevel(
                 {
                     *pLvlPos = static_cast<sal_uInt8>(nFnd + 1);
                     ++pLvlPos;
-                    sNumStr = sNumStr.replaceAt(nFnd, sSrch.getLength(), OUString(static_cast<char>(i)));
+                    sNumStr = sNumStr.replaceAt(nFnd, sSrch.getLength(), rtl::OUStringChar(static_cast<char>(i)));
                 }
             }
         }
@@ -635,7 +635,7 @@ void MSWordExportBase::SubstituteBullet( OUString& rNumStr,
     // If Bullet char is "", don't change
     if (rNumStr[0] != u'\0')
     {
-        rNumStr = rNumStr.replaceAt(0, 1, OUString(
+        rNumStr = rNumStr.replaceAt(0, 1, rtl::OUStringChar(
             msfilter::util::bestFitOpenSymbolToMSFont(rNumStr[0], rChrSet, sFontName)));
     }
 
diff --git a/sw/source/filter/ww8/ww8graf.cxx b/sw/source/filter/ww8/ww8graf.cxx
index 6a1d32d4ee21..35476fd90c34 100644
--- a/sw/source/filter/ww8/ww8graf.cxx
+++ b/sw/source/filter/ww8/ww8graf.cxx
@@ -542,7 +542,7 @@ static void lcl_StripFields(OUString &rString, WW8_CP &rNewStartCp)
         }
 
         const bool was0x14 = rString[nStopPos]==0x14;
-        rString = rString.replaceAt(nStartPos, nStopPos+1-nStartPos, "");
+        rString = rString.replaceAt(nStartPos, nStopPos+1-nStartPos, u"");
         rNewStartCp += nStopPos-nStartPos;
 
         if (was0x14)
@@ -551,7 +551,7 @@ static void lcl_StripFields(OUString &rString, WW8_CP &rNewStartCp)
             nStartPos = rString.indexOf(0x15, nStartPos);
             if (nStartPos<0)
                 return;
-            rString = rString.replaceAt(nStartPos, 1, "");
+            rString = rString.replaceAt(nStartPos, 1, u"");
         }
     }
 }
diff --git a/sw/source/filter/ww8/ww8par5.cxx b/sw/source/filter/ww8/ww8par5.cxx
index eba02826418e..85af5106bfaa 100644
--- a/sw/source/filter/ww8/ww8par5.cxx
+++ b/sw/source/filter/ww8/ww8par5.cxx
@@ -184,7 +184,7 @@ tools::Long SwWW8ImplReader::Read_Book(WW8PLCFManResult*)
             case 0x0d:
                 if( bAllowCr )
                 {
-                    aVal = aVal.replaceAt( nI, 1, "\n" );
+                    aVal = aVal.replaceAt( nI, 1, u"\n" );
                     bSetAsHex = false;
                 }
                 else
@@ -1058,29 +1058,29 @@ void SwWW8ImplReader::MakeTagString( OUString& rStr, const OUString& rOrg )
             case 132:                       // Exchange typographical quotation marks for normal ones
             case 148:
             case 147:
-                rStr = rStr.replaceAt( nI, 1, "\"" );
+                rStr = rStr.replaceAt( nI, 1, u"\"" );
                 break;
             case 19:
-                rStr = rStr.replaceAt( nI, 1, "{" );
+                rStr = rStr.replaceAt( nI, 1, u"{" );
                 break;  // 19..21 to {|}
             case 20:
-                rStr = rStr.replaceAt( nI, 1, "|" );
+                rStr = rStr.replaceAt( nI, 1, u"|" );
                 break;
             case 21:
-                rStr = rStr.replaceAt( nI, 1, "}" );
+                rStr = rStr.replaceAt( nI, 1, u"}" );
                 break;
             case '\\':                      // Tag \{|} with \ ...
             case '{':
             case '|':
             case '}':
-                rStr = rStr.replaceAt( nI, 0, "\\" );
+                rStr = rStr.replaceAt( nI, 0, u"\\" );
                 ++nI;
                 break;
             case 0x0b:
             case 0x0c:
             case 0x0d:
                 if( bAllowCr )
-                    rStr = rStr.replaceAt( nI, 1, "\n" );
+                    rStr = rStr.replaceAt( nI, 1, u"\n" );
                 else
                     bSetAsHex = true;
                 break;
diff --git a/sw/source/ui/dbui/dbinsdlg.cxx b/sw/source/ui/dbui/dbinsdlg.cxx
index 041412a32dba..83440e7bde58 100644
--- a/sw/source/ui/dbui/dbinsdlg.cxx
+++ b/sw/source/ui/dbui/dbinsdlg.cxx
@@ -555,7 +555,7 @@ IMPL_LINK( SwInsertDBColAutoPilot, TableToFromHdl, weld::Button&, rButton, void
             const sal_Int32 nSel = nMax - nPos;
             if( nSel )
                 // first delete the existing selection
-                aStr = aStr.replaceAt( nPos, nSel, "" );
+                aStr = aStr.replaceAt( nPos, nSel, u"" );
 
             aField = OUStringChar(cDBFieldStart) + aField + OUStringChar(cDBFieldEnd);
             if( !aStr.isEmpty() )
diff --git a/sw/source/ui/dialog/ascfldlg.cxx b/sw/source/ui/dialog/ascfldlg.cxx
index ee6733259408..2812cc3be8a5 100644
--- a/sw/source/ui/dialog/ascfldlg.cxx
+++ b/sw/source/ui/dialog/ascfldlg.cxx
@@ -101,7 +101,7 @@ SwAsciiFilterDlg::SwAsciiFilterDlg( weld::Window* pParent, SwDocShell& rDocSh,
                 if(sAsciiOptions.isEmpty())
                     sAsciiOptions = m_sExtraData.copy(nStt, nEnd - nStt);
                 nStt -= nDialogExtraDataLen;
-                m_sExtraData = m_sExtraData.replaceAt(nStt, nEnd - nStt + 1, "");
+                m_sExtraData = m_sExtraData.replaceAt(nStt, nEnd - nStt + 1, u"");
             }
         }
         if(!sAsciiOptions.isEmpty())
@@ -303,7 +303,7 @@ void SwAsciiFilterDlg::FillOptions( SwAsciiOptions& rOptions )
         sal_Int32 nEnd = m_sExtraData.indexOf( cDialogExtraDataClose,
                                         nStt + nDialogExtraDataLen );
         if( -1 != nEnd )
-            m_sExtraData = m_sExtraData.replaceAt( nStt, nEnd - nStt + 1, "" );
+            m_sExtraData = m_sExtraData.replaceAt( nStt, nEnd - nStt + 1, u"" );
     }
     m_sExtraData += sFindNm + sData + OUStringChar(cDialogExtraDataClose);
 }
diff --git a/sw/source/uibase/app/applab.cxx b/sw/source/uibase/app/applab.cxx
index 4bb9ed9f49c1..47af40becc01 100644
--- a/sw/source/uibase/app/applab.cxx
+++ b/sw/source/uibase/app/applab.cxx
@@ -125,7 +125,7 @@ static const SwFrameFormat *lcl_InsertLabText( SwWrtShell& rSh, const SwLabItem&
     OUString sDBName;
     if( (!rItem.m_bSynchron || !(nCol|nRow)) && !(sDBName = InsertLabEnvText( rSh, rFieldMgr, rItem.m_aWriting )).isEmpty() && !bLast )
     {
-        sDBName = comphelper::string::setToken(sDBName, 3, DB_DELIM, "True");
+        sDBName = comphelper::string::setToken(sDBName, 3, DB_DELIM, u"True");
         SwInsertField_Data aData(SwFieldTypesEnum::DatabaseNextSet, 0, sDBName, OUString(), 0, &rSh);
         rFieldMgr.InsertField( aData );
     }
diff --git a/sw/source/uibase/dbui/dbmgr.cxx b/sw/source/uibase/dbui/dbmgr.cxx
index fb1aedb3bdd7..9323c52770b2 100644
--- a/sw/source/uibase/dbui/dbmgr.cxx
+++ b/sw/source/uibase/dbui/dbmgr.cxx
@@ -2686,7 +2686,7 @@ OUString LoadAndRegisterDataSource_Impl(DBConnURIType type, const uno::Reference
         OUString sNewName = rURL.getName(
             INetURLObject::LAST_SEGMENT, true, INetURLObject::DecodeMechanism::Unambiguous);
         sal_Int32 nExtLen = sExt.getLength();
-        sNewName = sNewName.replaceAt(sNewName.getLength() - nExtLen - 1, nExtLen + 1, "");
+        sNewName = sNewName.replaceAt(sNewName.getLength() - nExtLen - 1, nExtLen + 1, u"");
 
         //find a unique name if sNewName already exists
         sFind = sNewName;
diff --git a/sw/source/uibase/docvw/edtwin.cxx b/sw/source/uibase/docvw/edtwin.cxx
index 4c8608c4a5b9..85e5eb8fb275 100644
--- a/sw/source/uibase/docvw/edtwin.cxx
+++ b/sw/source/uibase/docvw/edtwin.cxx
@@ -6085,7 +6085,7 @@ void QuickHelpData::FillStrArr( SwWrtShell const & rSh, const OUString& rWord )
         else
         {
             // First character is not lower case i.e. assume upper or title case
-            OUString sWordSentence = sWordLower.replaceAt( 0, 1, OUString(rWord[0]) );
+            OUString sWordSentence = sWordLower.replaceAt( 0, 1, rtl::OUStringChar(rWord[0]) );
             if ( rWord == sWordSentence )
                 aWordCase = CASE_SENTENCE;
             else
@@ -6121,7 +6121,7 @@ void QuickHelpData::FillStrArr( SwWrtShell const & rSh, const OUString& rWord )
                 if ( aWordCase == CASE_LOWER )
                     sStr = rCC.lowercase(rStr);
                 else if ( aWordCase == CASE_SENTENCE )
-                    sStr = rCC.lowercase(rStr).replaceAt(0, 1, OUString(rStr[0]));
+                    sStr = rCC.lowercase(rStr).replaceAt(0, 1, rtl::OUStringChar(rStr[0]));
                 else if ( aWordCase == CASE_UPPER )
                     sStr = rCC.uppercase(rStr);
 
@@ -6172,7 +6172,7 @@ void QuickHelpData::FillStrArr( SwWrtShell const & rSh, const OUString& rWord )
             sStr = rCC.lowercase(aCompletedString);
         else if (aWordCase == CASE_SENTENCE)
             sStr = rCC.lowercase(aCompletedString)
-                       .replaceAt(0, 1, OUString(aCompletedString[0]));
+                       .replaceAt(0, 1, rtl::OUStringChar(aCompletedString[0]));
         else if (aWordCase == CASE_UPPER)
             sStr = rCC.uppercase(aCompletedString);
 
diff --git a/sw/source/uibase/misc/redlndlg.cxx b/sw/source/uibase/misc/redlndlg.cxx
index e27a0a7d4c9b..cf5041236ee7 100644
--- a/sw/source/uibase/misc/redlndlg.cxx
+++ b/sw/source/uibase/misc/redlndlg.cxx
@@ -1173,7 +1173,7 @@ namespace
                 {
                     // cut out the alignment string
                     aStr = rExtraString.copy(nPos, n2 - nPos + 1);
-                    rExtraString = rExtraString.replaceAt(nPos, n2 - nPos + 1, "");
+                    rExtraString = rExtraString.replaceAt(nPos, n2 - nPos + 1, u"");
                     aStr = aStr.copy(n1 - nPos + 1);
                 }
             }
diff --git a/sw/source/uibase/shells/langhelper.cxx b/sw/source/uibase/shells/langhelper.cxx
index de01e243399c..0de6c4863ada 100644
--- a/sw/source/uibase/shells/langhelper.cxx
+++ b/sw/source/uibase/shells/langhelper.cxx
@@ -132,20 +132,20 @@ namespace SwLangHelper
                 if (-1 != (nPos = aNewLangText.indexOf( aSelectionLangPrefix )))
                 {
                     // ... for the current selection
-                    aNewLangText = aNewLangText.replaceAt(nPos, aSelectionLangPrefix.getLength(), "");
+                    aNewLangText = aNewLangText.replaceAt(nPos, aSelectionLangPrefix.getLength(), u"");
                     bForSelection = true;
                 }
                 else if (-1 != (nPos = aNewLangText.indexOf( aParagraphLangPrefix )))
                 {
                     // ... for the current paragraph language
-                    aNewLangText = aNewLangText.replaceAt(nPos, aParagraphLangPrefix.getLength(), "");
+                    aNewLangText = aNewLangText.replaceAt(nPos, aParagraphLangPrefix.getLength(), u"");
                     bForSelection = true;
                     bForParagraph = true;
                 }
                 else if (-1 != (nPos = aNewLangText.indexOf( aDocumentLangPrefix )))
                 {
                     // ... as default document language
-                    aNewLangText = aNewLangText.replaceAt(nPos, aDocumentLangPrefix.getLength(), "");
+                    aNewLangText = aNewLangText.replaceAt(nPos, aDocumentLangPrefix.getLength(), u"");
                     bForSelection = false;
                 }
 
diff --git a/sw/source/uibase/shells/textsh1.cxx b/sw/source/uibase/shells/textsh1.cxx
index f3b83841ccf1..0436659b20a0 100644
--- a/sw/source/uibase/shells/textsh1.cxx
+++ b/sw/source/uibase/shells/textsh1.cxx
@@ -478,20 +478,20 @@ void SwTextShell::Execute(SfxRequest &rReq)
                     if (-1 != (nPos = aNewLangText.indexOf( aSelectionLangPrefix )))
                     {
                         // ... for the current selection
-                        aNewLangText = aNewLangText.replaceAt(nPos, aSelectionLangPrefix.getLength(), "");
+                        aNewLangText = aNewLangText.replaceAt(nPos, aSelectionLangPrefix.getLength(), u"");
                         bForSelection = true;
                     }
                     else if (-1 != (nPos = aNewLangText.indexOf(aParagraphLangPrefix)))
                     {
                         // ... for the current paragraph language
-                        aNewLangText = aNewLangText.replaceAt(nPos, aParagraphLangPrefix.getLength(), "");
+                        aNewLangText = aNewLangText.replaceAt(nPos, aParagraphLangPrefix.getLength(), u"");
                         bForSelection = true;
                         bForParagraph = true;
                     }
                     else if (-1 != (nPos = aNewLangText.indexOf(aDocumentLangPrefix)))
                     {
                         // ... as default document language
-                        aNewLangText = aNewLangText.replaceAt(nPos, aDocumentLangPrefix.getLength(), "");
+                        aNewLangText = aNewLangText.replaceAt(nPos, aDocumentLangPrefix.getLength(), u"");
                         bForSelection = false;
                     }
 
@@ -1574,12 +1574,12 @@ void SwTextShell::Execute(SfxRequest &rReq)
         uno::Reference< linguistic2::XSpellAlternatives >  xSpellAlt;
         if(-1 != (nPos = sApplyText.indexOf( sGrammarRule )))
         {
-            sApplyText = sApplyText.replaceAt(nPos, sGrammarRule.getLength(), "");
+            sApplyText = sApplyText.replaceAt(nPos, sGrammarRule.getLength(), u"");
             bGrammar = true;
         }
         else if (-1 != (nPos = sApplyText.indexOf( sSpellingRule )))
         {
-            sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), "");
+            sApplyText = sApplyText.replaceAt(nPos, sSpellingRule.getLength(), u"");
             SwRect aToFill;
             xSpellAlt.set(rWrtSh.GetCorrection(nullptr, aToFill));
             bGrammar = false;
diff --git a/sw/source/uibase/uiview/srcview.cxx b/sw/source/uibase/uiview/srcview.cxx
index a5c2791da06b..050df4445d0c 100644
--- a/sw/source/uibase/uiview/srcview.cxx
+++ b/sw/source/uibase/uiview/srcview.cxx
@@ -183,7 +183,7 @@ static OUString lcl_ConvertTabsToSpaces( const OUString& sLine )
         }
         // Not 4 blanks, but on 4th TabPos:
         const sal_Int32 nPadLen = 4 - (nPos % 4);
-        aRet = aRet.replaceAt(nPos, 1, OUString(aPadSpaces, nPadLen));
+        aRet = aRet.replaceAt(nPos, 1, std::u16string_view{aPadSpaces, static_cast<size_t>(nPadLen)});
         nPos += nPadLen;
     }
     return aRet;
diff --git a/tools/source/fsys/urlobj.cxx b/tools/source/fsys/urlobj.cxx
index 6f4dfd068304..dee820474a73 100644
--- a/tools/source/fsys/urlobj.cxx
+++ b/tools/source/fsys/urlobj.cxx
@@ -2291,7 +2291,7 @@ namespace
     void lcl_Erase(OUStringBuffer &rBuf, sal_Int32 index, sal_Int32 count)
     {
         OUString sTemp(rBuf.makeStringAndClear());
-        rBuf.append(sTemp.replaceAt(index, count, OUString()));
+        rBuf.append(sTemp.replaceAt(index, count, u""));
     }
 }
 
diff --git a/ucb/source/ucp/hierarchy/hierarchyuri.cxx b/ucb/source/ucp/hierarchy/hierarchyuri.cxx
index 90aab6235ef1..618a640229c5 100644
--- a/ucb/source/ucp/hierarchy/hierarchyuri.cxx
+++ b/ucb/source/ucp/hierarchy/hierarchyuri.cxx
@@ -92,7 +92,7 @@ void HierarchyUri::init() const
             m_aUri = m_aUri.replaceAt(
                         HIERARCHY_URL_SCHEME.getLength() + 2,
                         0,
-                        "/" + DEFAULT_DATA_SOURCE_SERVICE + "/" );
+                        rtl::OUStringConcatenation("/" + DEFAULT_DATA_SOURCE_SERVICE + "/") );
             m_aService = DEFAULT_DATA_SOURCE_SERVICE;
 
             nPos
diff --git a/vcl/osx/salmenu.cxx b/vcl/osx/salmenu.cxx
index aeda577a2615..3164ba873bae 100644
--- a/vcl/osx/salmenu.cxx
+++ b/vcl/osx/salmenu.cxx
@@ -601,7 +601,7 @@ void AquaSalMenu::SetItemText( unsigned /*i_nPos*/, SalMenuItem* i_pSalMenuItem,
         {
             sal_Int32 nPos2 = aText.indexOf( ')' );
             if( nPos2 != -1 )
-                aText = aText.replaceAt( nPos, nPos2-nPos+1, "" );
+                aText = aText.replaceAt( nPos, nPos2-nPos+1, u"" );
         }
     }
 
diff --git a/vcl/source/control/combobox.cxx b/vcl/source/control/combobox.cxx
index de3de3d6e1f7..1f728ce03ab4 100644
--- a/vcl/source/control/combobox.cxx
+++ b/vcl/source/control/combobox.cxx
@@ -376,7 +376,7 @@ IMPL_LINK_NOARG(ComboBox::Impl, ImplSelectHdl, LinkParamNone*, void)
                 sal_Int32 nP = m_pImplLB->GetEntryList().FindEntry( aToken );
                 if ((nP != LISTBOX_ENTRY_NOTFOUND) && (!m_pImplLB->GetEntryList().IsEntryPosSelected(nP)))
                 {
-                    aText = aText.replaceAt( nPrevIndex, nTokenLen, "" );
+                    aText = aText.replaceAt( nPrevIndex, nTokenLen, u"" );
                     nIndex = nIndex - nTokenLen;
                     sal_Int32 nSepCount=0;
                     if ((nPrevIndex+nSepCount < aText.getLength()) && (aText[nPrevIndex+nSepCount] == m_cMultiSep))
@@ -384,7 +384,7 @@ IMPL_LINK_NOARG(ComboBox::Impl, ImplSelectHdl, LinkParamNone*, void)
                         nIndex--;
                         ++nSepCount;
                     }
-                    aText = aText.replaceAt( nPrevIndex, nSepCount, "" );
+                    aText = aText.replaceAt( nPrevIndex, nSepCount, u"" );
                 }
                 aText = comphelper::string::strip(aText, ' ');
             }
diff --git a/vcl/source/control/tabctrl.cxx b/vcl/source/control/tabctrl.cxx
index a3e2264d3f8c..9e39516887c4 100644
--- a/vcl/source/control/tabctrl.cxx
+++ b/vcl/source/control/tabctrl.cxx
@@ -264,7 +264,7 @@ Size TabControl::ImplGetItemSize( ImplTabItem* pItem, tools::Long nMaxWidth )
         do
         {
             if (pItem->maFormatText.getLength() > aAppendStr.getLength())
-                pItem->maFormatText = pItem->maFormatText.replaceAt( pItem->maFormatText.getLength()-aAppendStr.getLength()-1, 1, "" );
+                pItem->maFormatText = pItem->maFormatText.replaceAt( pItem->maFormatText.getLength()-aAppendStr.getLength()-1, 1, u"" );
             aSize.setWidth( GetOutDev()->GetCtrlTextWidth( pItem->maFormatText ) );
             aSize.AdjustWidth(aImageSize.Width() );
             aSize.AdjustWidth(TAB_TABOFFSET_X*2 );
diff --git a/vcl/source/edit/textdoc.cxx b/vcl/source/edit/textdoc.cxx
index 2be8c372c273..9e0c80b96815 100644
--- a/vcl/source/edit/textdoc.cxx
+++ b/vcl/source/edit/textdoc.cxx
@@ -271,13 +271,13 @@ void TextNode::InsertText( sal_Int32 nPos, const OUString& rText )
 
 void TextNode::InsertText( sal_Int32 nPos, sal_Unicode c )
 {
-    maText = maText.replaceAt( nPos, 0, OUString(c) );
+    maText = maText.replaceAt( nPos, 0, rtl::OUStringChar(c) );
     ExpandAttribs( nPos, 1 );
 }
 
 void TextNode::RemoveText( sal_Int32 nPos, sal_Int32 nChars )
 {
-    maText = maText.replaceAt( nPos, nChars, "" );
+    maText = maText.replaceAt( nPos, nChars, u"" );
     CollapseAttribs( nPos, nChars );
 }
 
diff --git a/vcl/source/filter/FilterConfigCache.cxx b/vcl/source/filter/FilterConfigCache.cxx
index 64e4e6929dea..a314a6ca1660 100644
--- a/vcl/source/filter/FilterConfigCache.cxx
+++ b/vcl/source/filter/FilterConfigCache.cxx
@@ -69,7 +69,7 @@ OUString FilterConfigCache::FilterConfigCacheEntry::GetShortName()
     {
         aShortName = lExtensionList[ 0 ];
         if ( aShortName.startsWith( "*." ) )
-            aShortName = aShortName.replaceAt( 0, 2, "" );
+            aShortName = aShortName.replaceAt( 0, 2, u"" );
     }
     return aShortName;
 }
@@ -375,7 +375,7 @@ OUString FilterConfigCache::GetImportWildcard(sal_uInt16 nFormat, sal_Int32 nEnt
 {
     OUString aWildcard( GetImportFormatExtension( nFormat, nEntry ) );
     if ( !aWildcard.isEmpty() )
-        aWildcard = aWildcard.replaceAt( 0, 0, "*." );
+        aWildcard = aWildcard.replaceAt( 0, 0, u"*." );
     return aWildcard;
 }
 
@@ -473,7 +473,7 @@ OUString FilterConfigCache::GetExportWildcard( sal_uInt16 nFormat, sal_Int32 nEn
 {
     OUString aWildcard( GetExportFormatExtension( nFormat, nEntry ) );
     if ( !aWildcard.isEmpty() )
-        aWildcard = aWildcard.replaceAt( 0, 0, "*." );
+        aWildcard = aWildcard.replaceAt( 0, 0, u"*." );
     return aWildcard;
 }
 
diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index 48dda1916a0f..3db1ca90f235 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -7054,7 +7054,7 @@ void PDFWriterImpl::drawStrikeoutChar( const Point& rPos, tools::Long nWidth, Fo
 
     // do not get broader than nWidth modulo 1 character
     while( GetTextWidth( aStrikeout ) >= nWidth )
-        aStrikeout = aStrikeout.replaceAt( 0, 1, "" );
+        aStrikeout = aStrikeout.replaceAt( 0, 1, u"" );
     aStrikeout += aStrikeoutChar;
     bool bShadow = m_aCurrentPDFState.m_aFont.IsShadow();
     if ( bShadow )
diff --git a/vcl/source/image/ImplImage.cxx b/vcl/source/image/ImplImage.cxx
index 6df732c09d97..a5637c3bb452 100644
--- a/vcl/source/image/ImplImage.cxx
+++ b/vcl/source/image/ImplImage.cxx
@@ -66,7 +66,7 @@ bool ImplImage::loadStockAtScale(double fScale, BitmapEx &rBitmapEx)
             sal_Int32 nStart = maStockName.indexOf("%3f");
             sal_Int32 nEnd = maStockName.lastIndexOf(".");
 
-            OUString aFileName = maStockName.replaceAt(nStart, nEnd - nStart, "");
+            OUString aFileName = maStockName.replaceAt(nStart, nEnd - nStart, u"");
             if (!ImageTree::get().loadImage(aFileName, aIconTheme, aBitmapEx, true,
                                             nScalePercentage, eScalingFlags))
             {
diff --git a/vcl/source/outdev/text.cxx b/vcl/source/outdev/text.cxx
index bdeee4fbc428..8fb3a2c87118 100644
--- a/vcl/source/outdev/text.cxx
+++ b/vcl/source/outdev/text.cxx
@@ -2023,7 +2023,7 @@ OUString OutputDevice::ImplGetEllipsisString( const OutputDevice& rTargetDevice,
                 {
                     if ( (nIndex > 1) || (nIndex == aStr.getLength()) )
                         nIndex--;
-                    aStr = aStr.replaceAt( nIndex, 1, "");
+                    aStr = aStr.replaceAt( nIndex, 1, u"");
                 }
             }
 
@@ -2295,12 +2295,12 @@ OUString OutputDevice::GetNonMnemonicString( const OUString& rStr, sal_Int32& rM
             {
                 if ( rMnemonicPos == -1 )
                     rMnemonicPos = i;
-                aStr = aStr.replaceAt( i, 1, "" );
+                aStr = aStr.replaceAt( i, 1, u"" );
                 nLen--;
             }
             else
             {
-                aStr = aStr.replaceAt( i, 1, "" );
+                aStr = aStr.replaceAt( i, 1, u"" );
                 nLen--;
                 i++;
             }
diff --git a/vcl/source/treelist/transfer.cxx b/vcl/source/treelist/transfer.cxx
index 35422acc2273..f86501cc8def 100644
--- a/vcl/source/treelist/transfer.cxx
+++ b/vcl/source/treelist/transfer.cxx
@@ -1875,7 +1875,7 @@ bool TransferableDataHelper::GetINetBookmark( const css::datatransfer::DataFlavo
                     }
                     aURL = aString.copy( nStart + 1, nLen );
 
-                    aString = aString.replaceAt( 0, nStart + 1 + nLen, "" );
+                    aString = aString.replaceAt( 0, nStart + 1 + nLen, u"" );
                     nStart = aString.indexOf( '@' );
                     nLen = aString.toInt32();
 
diff --git a/vcl/source/window/mnemonic.cxx b/vcl/source/window/mnemonic.cxx
index 4dd12668b48d..d412b2ad4071 100644
--- a/vcl/source/window/mnemonic.cxx
+++ b/vcl/source/window/mnemonic.cxx
@@ -195,7 +195,7 @@ OUString MnemonicGenerator::CreateMnemonic( const OUString& _rKey )
                 if ( maMnemonics[nMnemonicIndex] )
                 {
                     maMnemonics[nMnemonicIndex] = 0;
-                    rKey = rKey.replaceAt( nIndex, 0, OUString(m_cMnemonic) );
+                    rKey = rKey.replaceAt( nIndex, 0, rtl::OUStringChar(m_cMnemonic) );
                     bChanged = true;
                     break;
                 }
@@ -247,7 +247,7 @@ OUString MnemonicGenerator::CreateMnemonic( const OUString& _rKey )
             if ( nBestCount != 0xFFFF )
             {
                 maMnemonics[nBestMnemonicIndex] = 0;
-                rKey = rKey.replaceAt( nBestIndex, 0, OUString(m_cMnemonic) );
+                rKey = rKey.replaceAt( nBestIndex, 0, rtl::OUStringChar(m_cMnemonic) );
                 bChanged = true;
             }
         }
@@ -327,7 +327,7 @@ OUString MnemonicGenerator::EraseAllMnemonicChars( const OUString& rStr )
                     aStr[ i+2 ] == ')' &&
                     c >= MNEMONIC_RANGE_2_START && c <= MNEMONIC_RANGE_2_END )
                 {
-                    aStr = aStr.replaceAt( i-1, 4, "" );
+                    aStr = aStr.replaceAt( i-1, 4, u"" );
                     nLen -= 4;
                     i--;
                     continue;
@@ -335,7 +335,7 @@ OUString MnemonicGenerator::EraseAllMnemonicChars( const OUString& rStr )
             }
 
             // remove standard mnemonics
-            aStr = aStr.replaceAt( i, 1, "" );
+            aStr = aStr.replaceAt( i, 1, u"" );
             nLen--;
         }
         else
diff --git a/vcl/unx/generic/printer/ppdparser.cxx b/vcl/unx/generic/printer/ppdparser.cxx
index 8ea34f144054..f9309413825e 100644
--- a/vcl/unx/generic/printer/ppdparser.cxx
+++ b/vcl/unx/generic/printer/ppdparser.cxx
@@ -1320,7 +1320,7 @@ void PPDParser::parseOrderDependency(const OString& rLine)
     OUString aKey(OStringToOUString(GetCommandLineToken(2, aLine), RTL_TEXTENCODING_MS_1252));
     if( aKey[ 0 ] != '*' )
         return; // invalid order dependency
-    aKey = aKey.replaceAt( 0, 1, "" );
+    aKey = aKey.replaceAt( 0, 1, u"" );
 
     PPDKey* pKey;
     PPDParser::hash_type::const_iterator keyit = m_aKeys.find( aKey );
@@ -1354,7 +1354,7 @@ void PPDParser::parseConstraint( const OString& rLine )
     OUString aLine(OStringToOUString(rLine, RTL_TEXTENCODING_MS_1252));
     sal_Int32 nIdx = rLine.indexOf(':');
     if (nIdx != -1)
-        aLine = aLine.replaceAt(0, nIdx + 1, "");
+        aLine = aLine.replaceAt(0, nIdx + 1, u"");
     PPDConstraint aConstraint;
     int nTokens = GetCommandLineTokenCount( aLine );
     for( int i = 0; i < nTokens; i++ )
@@ -1362,7 +1362,7 @@ void PPDParser::parseConstraint( const OString& rLine )
         OUString aToken = GetCommandLineToken( i, aLine );
         if( !aToken.isEmpty() && aToken[ 0 ] == '*' )
         {
-            aToken = aToken.replaceAt( 0, 1, "" );
+            aToken = aToken.replaceAt( 0, 1, u"" );
             if( aConstraint.m_pKey1 )
                 aConstraint.m_pKey2 = getKey( aToken );
             else
diff --git a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
index 8c0e638d024b..3c52b7ca3981 100644
--- a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
+++ b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
@@ -439,11 +439,11 @@ shrinkFilterName( const OUString &rFilterName, bool bAllowNoStar = false )
             if( nBracketEnd <= 0 )
                 continue;
             if( isFilterString( rFilterName.copy( i + 1, nBracketLen - 1 ), "*." ) )
-                aRealName = aRealName.replaceAt( i, nBracketLen + 1, OUString() );
+                aRealName = aRealName.replaceAt( i, nBracketLen + 1, u"" );
             else if (bAllowNoStar)
             {
                 if( isFilterString( rFilterName.copy( i + 1, nBracketLen - 1 ), ".") )
-                    aRealName = aRealName.replaceAt( i, nBracketLen + 1, OUString() );
+                    aRealName = aRealName.replaceAt( i, nBracketLen + 1, u"" );
             }
         }
     }
diff --git a/writerfilter/source/dmapper/DomainMapper_Impl.cxx b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
index b52969e300a7..97cb3511506b 100644
--- a/writerfilter/source/dmapper/DomainMapper_Impl.cxx
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
@@ -3978,7 +3978,7 @@ static OUString lcl_ParseFormat( const OUString& rCommand )
     if (delimPos != -1)
     {
         sal_Int32 wsChars = rCommand.indexOf('\"') - delimPos - 2;
-        command = rCommand.replaceAt(delimPos+2, wsChars, "");
+        command = rCommand.replaceAt(delimPos+2, wsChars, u"");
     }
     else
         command = rCommand;
@@ -4973,7 +4973,7 @@ void DomainMapper_Impl::handleFieldFormula
     sal_Int32 delimPos = command.indexOf("\\#");
     if (delimPos != -1)
     {
-        command = command.replaceAt(delimPos, command.getLength() - delimPos, "").trim();
+        command = command.replaceAt(delimPos, command.getLength() - delimPos, u"").trim();
     }
 
     // command must contains = and at least another char
diff --git a/xmlhelp/source/treeview/tvread.cxx b/xmlhelp/source/treeview/tvread.cxx
index 17e3116e26ad..d7dd36714dea 100644
--- a/xmlhelp/source/treeview/tvread.cxx
+++ b/xmlhelp/source/treeview/tvread.cxx
@@ -464,7 +464,7 @@ TVChildTarget::SearchAndInsert(std::unique_ptr<TVDom> p, TVDom* tvDom)
     for(i = tvDom->children.begin(); i!=tvDom->children.end(); ++i)
         if (!((*i)->isLeaf()) &&
             ((*i)->id.getLength() == p->id.getLength()) &&
-            (p->id.replaceAt((*i)->parent->id.getLength(), p->id.getLength()-(*i)->parent->id.getLength(), "") == (*i)->parent->id))      //prefix check
+            (p->id.replaceAt((*i)->parent->id.getLength(), p->id.getLength()-(*i)->parent->id.getLength(), u"") == (*i)->parent->id))      //prefix check
         {
             h = true;
             c_int = (*i)->id.toInt32();
diff --git a/xmloff/source/style/xmlnumfi.cxx b/xmloff/source/style/xmlnumfi.cxx
index bc2f7f948130..87f653873904 100644
--- a/xmloff/source/style/xmlnumfi.cxx
+++ b/xmloff/source/style/xmlnumfi.cxx
@@ -2014,7 +2014,7 @@ void SvXMLNumFormatContext::AddCondition( const sal_Int32 nIndex )
         sal_Int32 nPos = sRealCond.indexOf( "!=" );
         if ( nPos >= 0 )
         {
-            sRealCond = sRealCond.replaceAt( nPos, 2, "<>" );
+            sRealCond = sRealCond.replaceAt( nPos, 2, u"<>" );
         }
 
         nPos = sRealCond.indexOf( '.' );
author	Noel Grandin <noel.grandin@collabora.co.uk>	2021-11-22 14:08:27 +0200
committer	Noel Grandin <noel.grandin@collabora.co.uk>	2021-11-23 14:00:08 +0100
commit	ec1c4c49301758c54394f9943252e192ad54638b (patch)
tree	b53af3cb9154a388495b1af35c3f8ff41d6ebe1f
parent	db0f2c29bf3a6ad5a08f8524ea0e65aa90792bb2 (diff)