No. ^. is not equivalent. ^. means to match the first character on
the line, and if doing a replace then the first character would be
deleted. ^ by itself matches the start of the line (not including any
characters), and replacing it with something effectively inserts the
"replacement" text at the start of the line. You could use something
ugly like replacing ^(.) with ${1}PREFIX to avoid deleting the first
character, but that would fail on blank lines which don't have any
characters in them.
In any case, ^ (by itslef) is a standard, well-defined regular expression
syntax used everywhere else (Perl, Python, vim etc. etc.) and Libre Office
should not do something incompatible.
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https://bugs.launchpad.net/bugs/465309
Title:
[Upstream] Regular Expression Search for circumflex by itself does not
find beginning of a paragraph
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