regex: handle zero-length matches, fdo#60259 related

Also in backward search ignore all zero-length matches except the text
end single $ anchor search. The anchor search is a valid match, treat it
as such in Writer.

This still doesn't solve the backward $ backward search, the convoluted
Writer code in that place apparently never worked, someone more familiar
with those internals should straighten out the mess.

Change-Id: I2bc83cdcfe6425f9bebf06e23e879bc79b82daa9

0 files changed, 0 insertions, 0 deletions