From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.bugs Subject: bug#53680: Endless loop in peculiar case of string-match and string-match-p 27.02 and 28.0.50 Date: Tue, 01 Feb 2022 12:15:43 +0100 Message-ID: <87pmo63kio.fsf@igel.home> References: <183c66f4-463a-b372-feee-5af9f6f45719@cvj.se> <8735l2x35t.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18003"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux) Cc: Christian Johansson , 53680@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Feb 01 13:23:39 2022 Return-path: Envelope-to: geb-bug-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 1nEsCB-0004WN-E2 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 01 Feb 2022 13:23:39 +0100 Original-Received: from localhost ([::1]:40666 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nEsCA-0005DH-8b for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 01 Feb 2022 07:23:38 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:57696) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nEr8v-0005v0-Pc for bug-gnu-emacs@gnu.org; Tue, 01 Feb 2022 06:16:23 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:48933) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nEr8j-0003v0-Sb for bug-gnu-emacs@gnu.org; Tue, 01 Feb 2022 06:16:04 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1nEr8j-0003fG-Mv for bug-gnu-emacs@gnu.org; Tue, 01 Feb 2022 06:16:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Andreas Schwab Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 01 Feb 2022 11:16:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 53680 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: confirmed Original-Received: via spool by 53680-submit@debbugs.gnu.org id=B53680.164371415013418 (code B ref 53680); Tue, 01 Feb 2022 11:16:01 +0000 Original-Received: (at 53680) by debbugs.gnu.org; 1 Feb 2022 11:15:50 +0000 Original-Received: from localhost ([127.0.0.1]:41836 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nEr8Y-0003U8-3s for submit@debbugs.gnu.org; Tue, 01 Feb 2022 06:15:50 -0500 Original-Received: from mail-out.m-online.net ([212.18.0.9]:56533) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nEr8V-0003QX-T5 for 53680@debbugs.gnu.org; Tue, 01 Feb 2022 06:15:48 -0500 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4Jp2RQ2Cb3z1r4ZZ; Tue, 1 Feb 2022 12:15:46 +0100 (CET) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4Jp2RQ1fQLz1qqkD; Tue, 1 Feb 2022 12:15:46 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id xYLlzgcObARH; Tue, 1 Feb 2022 12:15:45 +0100 (CET) X-Auth-Info: SYs/dLX3RKIYQWWoxzUnh2gRMSMJ4pYCRDZVR6D4U4IgPLwTVF58WCO9bvurAGn3 Original-Received: from igel.home (ppp-46-244-190-116.dynamic.mnet-online.de [46.244.190.116]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Tue, 1 Feb 2022 12:15:45 +0100 (CET) Original-Received: by igel.home (Postfix, from userid 1000) id 9047F2C37EA; Tue, 1 Feb 2022 12:15:43 +0100 (CET) X-Yow: I once decorated my apartment entirely in ten foot salad forks!! In-Reply-To: <8735l2x35t.fsf@gnus.org> (Lars Ingebrigtsen's message of "Tue, 01 Feb 2022 12:00:14 +0100") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:225748 Archived-At: On Feb 01 2022, Lars Ingebrigtsen wrote: > I guess the ยท are supposed to be spaces, so it's: > > (string-match > "[\r\t ]*implements[\r\t ]+\\([\r\t ]*[\\a-zA-Z_0-9_]+,?\\)+[\r\t ]*{$" > "ariable implements \\Magento\\Framework\\Event\\OberserverInterface\r{\r public function __construct()\r ") > > And I can reproduce this on master, too. Is it a problem with excessive > backtracking, perhaps? It sure is. The nesting of the + operator without proper anchoring makes the search space explode. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."