From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.help Subject: Re: `compare-strings' style question Date: Fri, 20 Nov 2009 03:34:51 -0700 Message-ID: References: <20091119105024.GA6950@tomas> <20091120070318.GD30194@tomas> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1258713364 3649 80.91.229.12 (20 Nov 2009 10:36:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 20 Nov 2009 10:36:04 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Nov 20 11:35:58 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1NBQqH-0002bJ-DF for geh-help-gnu-emacs@m.gmane.org; Fri, 20 Nov 2009 11:35:57 +0100 Original-Received: from localhost ([127.0.0.1]:45074 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBQqF-0001mX-VI for geh-help-gnu-emacs@m.gmane.org; Fri, 20 Nov 2009 05:35:52 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NBQph-0001m6-Mr for help-gnu-emacs@gnu.org; Fri, 20 Nov 2009 05:35:17 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NBQpc-0001le-Kn for help-gnu-emacs@gnu.org; Fri, 20 Nov 2009 05:35:16 -0500 Original-Received: from [199.232.76.173] (port=48763 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBQpc-0001lb-4y for help-gnu-emacs@gnu.org; Fri, 20 Nov 2009 05:35:12 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:44950) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NBQpb-0006ht-NJ for help-gnu-emacs@gnu.org; Fri, 20 Nov 2009 05:35:11 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.50) id 1NBQpY-0002Ia-5C for help-gnu-emacs@gnu.org; Fri, 20 Nov 2009 11:35:08 +0100 Original-Received: from c-71-237-24-138.hsd1.co.comcast.net ([71.237.24.138]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 20 Nov 2009 11:35:08 +0100 Original-Received: from kevin.d.rodgers by c-71-237-24-138.hsd1.co.comcast.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 20 Nov 2009 11:35:08 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 30 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: c-71-237-24-138.hsd1.co.comcast.net User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812) In-Reply-To: <20091120070318.GD30194@tomas> X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:69968 Archived-At: tomas@tuxteam.de wrote: > On Thu, Nov 19, 2009 at 08:08:59PM -0700, Kevin Rodgers wrote: > >> (when (string-match (concat "^" (regexp-quote foo)) bar) >> ...) Oops, that should be: (when (let ((case-fold-search nil)) (string-match (concat "^" (regexp-quote foo)) bar)) ...) > Thanks -- but I was trying to avoid conjuring up the whole regexp > machinery for this task. I admit that this looks less confusing, though. Perhaps you could enlighten us with some performance measurements? Another contender: (let ((foo-len (length foo)) (bar-len (length bar))) (cond ((> bar-len foo-len) (equal foo (substring bar 0 (1- foo-len)))) ((= bar-len foo-len) (equal foo bar)) (t nil))) -- Kevin Rodgers Denver, Colorado, USA