GNU bug report logs - #23040
"Stack overflow in regexp matcher" when entering group

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Message #8 received at 23040 <at> debbugs.gnu.org (full text, mbox):

From: Nikolaus Rath <Nikolaus <at> rath.org>
To: 23040 <at> debbugs.gnu.org 
Subject: Resolved
Date: Wed, 27 Apr 2016 08:34:28 -0700

The problem here is that recently some spam has started to come with
extremely long "References" headers, and that the regular expression
used in one of my scoring rules is sub-optimal when applied to such long
strings.

In particular, the leading dot in "<.+@[a-z0-9]+\\.rath\\.org>" first
matches the entire reference header, and then emacs presumably has to
backtrack character by character (or something like that).

Fixing the rule by restricting the match to one message id fixes the
problem: "<[^<>@]+@[a-z0-9]+\\.rath\\.org>"

Best,
-Nikolaus

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