GNU bug report logs - #16046
Bug with Regexp Containing only a Character Class with a Caret

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Message #13 received at 16046-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Cameron Desautels <camdez <at> gmail.com>
Cc: 16046-done <at> debbugs.gnu.org
Subject: Re: bug#16046: Bug with Regexp Containing only a Character Class with
 a Caret (PATCH)
Date: Thu, 05 Dec 2013 15:26:38 -0500

> After further experimentation, I suspect that "[^]" is simply not
> a valid regular expression.

Indeed, according to the documentation, for ^ to be treated as itself,
it needs to be "not the first char", but since we have nothing else to
put there, we're kind of screwed.

> This suggests that the broken behavior is within
> `regexp-opt-charset`.  I've attached a patch for that function.

Thank you for tracking down the problem and providing a fix.  I just
installed it in trunk, closing,


        Stefan

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