[Libreoffice-bugs] [Bug 135538] Search-Replace: Regular Expression engine fails on zero length matches

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=135538

--- Comment #9 from masz0 at yahoo.co.uk ---
(In reply to Michael Warner from comment #8)
> (In reply to masz0 from comment #7)
> > (In reply to Michael Warner from comment #5)
> > > (In reply to Heiko Tietze from comment #4)
> > > > IIUC, the original request was to find digits like ABC1EFG per "\d *". Works
> > > 
> > > If I am not mistaken, "\d *" has a minimum length of one (a single digit),
> > > so is not an example of this bug. Trying to match "\d*" instead would have
> > > zero length.
> > 
> > No, "\d *" tries to match for 1 digit, followed by 0+ spaces.
> 
> Which is what I was trying to say. At any rate, I don't think it is a valid
> test case for the bug you reported, please correct me if I am wrong.

Oh, sorry, I misunderstood.

Affirmative for "\d *" being an invalid test.

Since it requires and matches one digit, not having any in the input (ABC-EFG)
will make it fail (legitimately; not thru the artificial limitation).

If the input does have digits (ABC1EFG), the pattern will match each in turn.
The matches will be length 1 (or more where followed one or more spaces) -
therefore LO won't discard them.

My problem was specifically about zero-width assertions "(?<=..)", "(?<!..)",
"(?=..)", "(?!..)", "^", and combinations of them. Unlike them, standalone "X*"
isn't very useful even though it too can be zero-length.

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