GNU bug report logs - #18013
looking-back is inefficient

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Package: emacs;

Reported by: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>

Date: Mon, 14 Jul 2014 09:48:02 UTC

Severity: minor

Tags: wontfix

Found in version 24.3.92

Done: npostavs <at> users.sourceforge.net

Bug is archived. No further changes may be made.

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Message #21 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Kevin Rodgers <kevin.d.rodgers <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#18013: 24.3.92; looking-back "[^\n]" taking a lot of time
 in large buffers
Date: Tue, 15 Jul 2014 00:08:01 -0600

On 7/14/14 5:12 AM, Nicolas Richard wrote:
> As you see it takes more than 8 seconds on my system, most of that time
> is spent looking-back (inserting the file is quick).
>
> (looking-back "[^\n]") is bad code, so I totally deserve this. Still, is
> it possible to make the search smarter when the match is supposed to be
> "anchored" at point ? Otherwise let's just close this bug.

Use "\\=" to match the empty string at point.

-- 
Kevin Rodgers
Denver, Colorado, USA
This bug report was last modified 8 years and 116 days ago.

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