From: "D. D. Brierton" <darren@dzr-web.com>
Subject: Re: Help needed with regexps
Date: Fri, 13 Feb 2004 19:57:20 +0000 [thread overview]
Message-ID: <pan.2004.02.13.19.57.20.442717@dzr-web.com> (raw)
In-Reply-To: jwvwu6qrcvv.fsf-monnier+gnu.emacs.help@asado.iro.umontreal.ca
On Fri, 13 Feb 2004 19:37:32 +0000, Stefan Monnier wrote:
>> :front "<style\\s-+\\(\\s-*.*\\s-+\\)*.*css\"?\\(\\s-*.*\\s-*\\)*\\s-*>"
>
> Regexps like A*.*B* are asking for trouble because there is an exponential
> numberof ways to match them and the regexp-engine uses backtracking.
> So it will get stuck trying them all, potentially for hours or even years.
> To you it just looks like "it's stuck".
Ah of course. I'm such a nincompoop sometimes. Removing the many .*s with
more specific expressions has solved the emacs tailspin problem. Thanks!
Best, Darren
--
======================================================================
D. D. Brierton darren@dzr-web.com www.dzr-web.com
Trying is the first step towards failure (Homer Simpson)
======================================================================
next prev parent reply other threads:[~2004-02-13 19:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-13 19:17 Help needed with regexps D. D. Brierton
2004-02-13 19:21 ` D. D. Brierton
2004-02-13 19:37 ` Stefan Monnier
2004-02-13 19:57 ` D. D. Brierton [this message]
2004-02-13 20:16 ` D. D. Brierton
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