GNU bug report logs - #60830
30.0.50; The *Compilation* buffer does not recognize Lua errors

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Message #76 received at 60830 <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Mattias Engdegård <mattias.engdegard <at> gmail.com>,
 60830 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#60830: 30.0.50; The *Compilation* buffer does not recognize
 Lua errors
Date: Thu, 12 Oct 2023 10:14:46 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> For true "regular expressions", you'd use conjunction and negation and
> Bob's your uncle, but sadly, our regexps don't support conjunction nor
> negation, so you're stuck doing it by hand, e.g.:
>
>     "\\|\\[\\|[^[].*\\|\\[C\\|\\[[^C].*\\|\\[C[^]].*\\|\\[C].+"
>
> Yes, it's hideous and it suffers from a really bad size-explosion
> syndrome.  I don't even want to think about how to encode "this group
> can match neither "joe" nor "henry".

After a bit of thinking, I used a shy group

  \\(?:\\[C\\]\\|.......\\)
       ^^^^^^^   ^^^^^^^  
       NEGATIVE  POSITIVE

This either matches nothing or the groups in the POSITIVE alternative.

Rudy
-- 
"I love deadlines.  I love the whooshing noise they make as they go by."
-- Douglas Adams, The Salmon of Doubt, 2002

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

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