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Re: Documentation on debugging regexp performance
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From: |
Wolfgang Jenkner |
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Subject: |
Re: Documentation on debugging regexp performance |
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Date: |
Thu, 21 Jan 2016 12:42:40 +0100 |
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User-agent: |
Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.1.50 (berkeley-unix) |
On Thu, Jan 21 2016, Clément Pit--Claudel wrote:
> I'm running into a surprising regular expressions issue. I have attached a
> file (~50k) in which (re-search-forward " +[^:=]+ +:=?") seems to be
> extremely slow. (I killed it after 30 seconds). Truncating the file to its
> first 20 lines reduces the time for re-search-forward to about a second,
> which is still extremely slow.
Perhaps you meant
(re-search-forward " +[^:=\n]+ +:=?")
Cf. (info "(elisp) Regexp Special"), in particular the section about
"complemented character alternative".