GNU bug report logs - #41185
highlight-regexp not working properly for multiline-matching regexps

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Message #13 received at 41185 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: jan <rtm443x <at> googlemail.com>, 41185 <at> debbugs.gnu.org
Subject: Re: bug#41185: highlight-regexp not working properly for
 multiline-matching regexps
Date: Sun, 13 Jun 2021 13:37:31 +0200

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> jan <rtm443x <at> googlemail.com> writes:
>
>> Try to regexp-highlight particular preprocessor use:
>>
>> M-s h r def HALF_LJ[^^]+?# endif RET
>>
>> (the [^^] is because I want it to match multiline, and I don't expect
>> any carets in the text, so I negate that to allow newline matches and
>> make it lazy to pick out the shortest +?  It's sloppy but ok here)
>>
>> Does not highlight anything
>
> Yes, thanks.
>
> I can reproduce this.  I'm not a font-lock expert, but I suspect that
> hi-lock doesn't support patterns matching multi-line text.

I can reproduce what the original bug report is seeing -- but that's
because the regexp seems to be wrong?  There's nothing in the test file
that matches "# endif".

However the following call does properly match the region I think was
intended, and works fine, as far as I can see (in Emacs 26.1 and 28):

(highlight-regexp "def HALF_LJ[^^]+?# +endif")

Or do I misunderstand what the original problem was?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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