From: Wolfgang Jenkner <wjenkner@inode.at>
To: "Clément Pit--Claudel" <clement.pit@gmail.com>
Cc: Emacs developers <emacs-devel@gnu.org>
Subject: Re: Documentation on debugging regexp performance
Date: Thu, 21 Jan 2016 12:42:40 +0100 [thread overview]
Message-ID: <85r3hbqczc.fsf@iznogoud.viz> (raw)
In-Reply-To: 56A06CD6.2090707@gmail.com
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".
next prev parent reply other threads:[~2016-01-21 11:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 5:29 Documentation on debugging regexp performance Clément Pit--Claudel
2016-01-21 6:36 ` Yuri Khan
2016-01-21 9:39 ` Alexis
2016-01-21 13:22 ` Clément Pit--Claudel
2016-01-21 22:10 ` Marcin Borkowski
2016-01-22 7:02 ` Alexis
2016-01-22 14:32 ` Clément Pit--Claudel
2016-01-21 11:42 ` Wolfgang Jenkner [this message]
2016-01-21 16:38 ` Clément Pit--Claudel
2016-01-21 15:27 ` Alan Mackenzie
2016-01-21 16:37 ` Clément Pit--Claudel
2016-01-21 17:16 ` Alan Mackenzie
2016-01-23 6:12 ` Stefan Monnier
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