GNU bug report logs - #64128
regexp parser zero-width assertion bugs

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Message #44 received at 64128 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Paul Eggert <eggert <at> cs.ucla.edu>,
 64128 <at> debbugs.gnu.org
Subject: Re: bug#64128: regexp parser zero-width assertion bugs
Date: Mon, 19 Jun 2023 16:08:57 -0400

>> If I understand things correctly, this would cause "\b*c" to be treated like "\b\*c".
> Actually it already works that way. What the patch does, is preventing
> AB\b*C from being treated as \(?:AB\b\)*C but as AB\b\*C instead, which
> I think we can all agree is less wrong.

Hmm... maybe it's less wrong, but I'd rather make it behave like
AB\(\b\)*C, which is, I'd argue, even less wrong.

Or maybe make it signal an error: I can't imagine that the current
behavior is used by very much code at all, seeing how it's so
seriously non-intuitive.


        Stefan

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