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bug#18577: Regexp I-search: [(error Stack overflow in regexp matcher)]


From: Andreas Schwab
Subject: bug#18577: Regexp I-search: [(error Stack overflow in regexp matcher)]
Date: Sun, 28 Sep 2014 12:56:48 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux)

Alan Mackenzie <acm@muc.de> writes:

> With point at BOB, do C-M-s and enter this regular expression at the
> prompt:
>
> /\*\(\([^'*]\|\*[^/']\)*\*?'\([^'*]\|\*[^/']\)*\*?'\)*\([^'*]\|\*[^'/]\)*\*?'\([^'*]\|\*[^/']\)*\*?\*/

\(...\(...\)*...\)* is bad.  \(...\)*\(...\)* is also bad.  Both can cause
combinatorial explosions in backtracking.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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