From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Performance of `re-search-backward' vs `re-search-forward' Date: Mon, 12 Apr 2021 07:38:41 +0200 Message-ID: <87czv0awpq.fsf@mbork.pl> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20561"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.1.0; emacs 28.0.50 To: Help Gnu Emacs mailing list Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Apr 12 07:39:57 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lVpIj-0005Aq-9s for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 12 Apr 2021 07:39:57 +0200 Original-Received: from localhost ([::1]:33522 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lVpIi-0006ch-8z for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 12 Apr 2021 01:39:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54982) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lVpHy-0006cU-AC for help-gnu-emacs@gnu.org; Mon, 12 Apr 2021 01:39:10 -0400 Original-Received: from mail.mojserwer.eu ([195.110.48.8]:36748) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lVpHr-0000hK-QC for help-gnu-emacs@gnu.org; Mon, 12 Apr 2021 01:39:09 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id 733A5E6DA4 for ; Mon, 12 Apr 2021 07:38:49 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L55N35WihO49 for ; Mon, 12 Apr 2021 07:38:45 +0200 (CEST) Original-Received: from localhost (178235147249.dynamic-3-poz-k-0-1-0.vectranet.pl [178.235.147.249]) by mail.mojserwer.eu (Postfix) with ESMTPSA id D5570E6226 for ; Mon, 12 Apr 2021 07:38:44 +0200 (CEST) Received-SPF: pass client-ip=195.110.48.8; envelope-from=mbork@mbork.pl; helo=mail.mojserwer.eu X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_20=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:128961 Archived-At: Hi all, I seem to (very vaguely) remember reading that `re-search-backward' is significantly slower than `re-search-forward'. However, I can't find anything about it in the docstring (nor in the Elisp reference) now. Am I even correct? If so, is it documented anywhere? (It would be fine with me if it weren't, this is not to say that the docs are buggy without mentioning it, I'm just curious.) TIA, -- Marcin Borkowski http://mbork.pl