From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Nicolas Richard Newsgroups: gmane.emacs.help Subject: looking-at-p slower than looking-at Date: Wed, 25 Nov 2015 14:58:12 +0100 Message-ID: <87vb8qb2q3.fsf_-_@ulb.ac.be> References: <87r3js7e8l.fsf@linux-qg7d.fritz.box> <87y4dzv1b3.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1448463124 20760 80.91.229.3 (25 Nov 2015 14:52:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 25 Nov 2015 14:52:04 +0000 (UTC) Cc: help-gnu-emacs@gnu.org, Barry Margolin To: Marcin Borkowski Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Nov 25 15:51:56 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1a1bQJ-0000vl-P2 for geh-help-gnu-emacs@m.gmane.org; Wed, 25 Nov 2015 15:51:55 +0100 Original-Received: from localhost ([::1]:45744 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1bQL-00006Q-2I for geh-help-gnu-emacs@m.gmane.org; Wed, 25 Nov 2015 09:51:57 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:40462) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1aaD-0003oq-7b for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 08:58:05 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a1aa7-0008Iy-IO for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 08:58:05 -0500 Original-Received: from mxin.ulb.ac.be ([164.15.128.112]:40392) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1aa7-0008HU-Cm for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 08:57:59 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtEEAIW9VVakD4Xx/2dsb2JhbABegmmCFIJfvVaGDwKCDQEBAQEBAYELhDUBAQMBeQULCBE4EARJE4gmCLlehCUBCyGGVI43BZZXjxGHNI9cg3JjhAU9NIUsAQEB Original-Received: from mathsrv4.ulb.ac.be (HELO localhost) ([164.15.133.241]) by smtp.ulb.ac.be with ESMTP; 25 Nov 2015 14:57:55 +0100 In-Reply-To: <87y4dzv1b3.fsf@mbork.pl> (Marcin Borkowski's message of "Sun, 15 Nov 2015 14:29:04 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 164.15.128.112 X-Mailman-Approved-At: Wed, 25 Nov 2015 09:51:42 -0500 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:108212 Archived-At: Marcin Borkowski writes: > You might also (depending on your use-case) want to use looking-at-p, > which is marginally slower than looking-at, but does not modify match > data. Why is it slower and how much slower is it ? I don't see how it can happen from its implementation: (defsubst looking-at-p (regexp) "\ Same as `looking-at' except this function does not change the match data." (let ((inhibit-changing-match-data t)) (looking-at regexp))) thanks, -- Nico.