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Re: Stack overflow in regexp matcher


From: Stephen Berman
Subject: Re: Stack overflow in regexp matcher
Date: Sun, 06 Feb 2011 14:31:43 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

On Sun, 06 Feb 2011 10:47:42 +0000 Dan Davison <address@hidden> wrote:

> The following fails with "Stack overflow in regexp matcher" in emacs 23
> and 24:
>
> (string-match
>  "^\\[.+\\]$"
>  (concat
>   "["
>   (mapconcat (lambda (i) "x") (number-sequence 1 33500) "")
>   "]"))
>
> This surprised me; I assumed that the ^ and $ anchors, and the simple
> ".+" requirement in the middle would result in a simple, efficient
> regexp.

It does not fail on my GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+
Version 2.20.1) of 2011-01-13, but returns, as expected, 0.

Steve Berman




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