From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.bugs Subject: bug#55744: infinite loop Date: Mon, 06 Jun 2022 18:15:06 -0400 Message-ID: References: <878rqh4g1z.fsf@gnus.org> <874k154fbj.fsf@gnus.org> <87v8tl2k18.fsf@gnus.org> <87a6aw4ct3.fsf@gnus.org> Reply-To: rms@gnu.org Content-Type: text/plain; charset=Utf-8 Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28267"; mail-complaints-to="usenet@ciao.gmane.io" Cc: danielrichardgrayson@gmail.com, 55744@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jun 07 00:16:12 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 1nyL1A-0007BA-7V for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 07 Jun 2022 00:16:12 +0200 Original-Received: from localhost ([::1]:50822 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nyL18-0000lC-QI for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 06 Jun 2022 18:16:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54546) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nyL10-0000kv-2C for bug-gnu-emacs@gnu.org; Mon, 06 Jun 2022 18:16:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:43147) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nyL0z-000471-Pr for bug-gnu-emacs@gnu.org; Mon, 06 Jun 2022 18:16:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1nyL0z-0008Kd-JP for bug-gnu-emacs@gnu.org; Mon, 06 Jun 2022 18:16:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Richard Stallman Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 06 Jun 2022 22:16:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 55744 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: notabug moreinfo Original-Received: via spool by 55744-submit@debbugs.gnu.org id=B55744.165455372031973 (code B ref 55744); Mon, 06 Jun 2022 22:16:01 +0000 Original-Received: (at 55744) by debbugs.gnu.org; 6 Jun 2022 22:15:20 +0000 Original-Received: from localhost ([127.0.0.1]:37044 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nyL0E-0008JY-MH for submit@debbugs.gnu.org; Mon, 06 Jun 2022 18:15:20 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:41126) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nyL0C-0008JG-0u for 55744@debbugs.gnu.org; Mon, 06 Jun 2022 18:15:12 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:48438) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nyL06-0003wl-Qx; Mon, 06 Jun 2022 18:15:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=Date:References:Subject:In-Reply-To:To:From: mime-version; bh=8i+FQBUwkLrm3NYc1tc9Qncp4khO+yu74Qt2f4DV8uQ=; b=M4UY2rgIGduc koSZQr+kHnkquKt7tRiDaP8F2sm7y8QyiuXGi48he1ysQ/m/RIX3jc1KYWhcW02wUkgk7P9+h7m/0 DtnhtN/i9QIPaXSBAuFq/EBGHR1xm2y0Ndf4V6WWd1qLrKumGpFR4Q9D8H/5IztlZ3fVJZsG1Pi10 pHGXcPhM1ToqVkLkB5FwPNXDv7j7cD64ezNXZPdPdC/Eebh+vjl3E4vx3HHUL/cUfOgITAqzvZSPH Yrk1h+9Dl2SkM0FhiXtDuvV1PQInjyO21PX0LYlAGpMBHSBDCpUF9LR4XCyqqx5WyyxUCZECZVH0Z WSygFsdW7ZvBha0Ng/72gQ==; Original-Received: from rms by fencepost.gnu.org with local (Exim 4.90_1) (envelope-from ) id 1nyL06-0000RB-AP; Mon, 06 Jun 2022 18:15:06 -0400 In-Reply-To: <87a6aw4ct3.fsf@gnus.org> (message from Lars Ingebrigtsen on Wed, 01 Jun 2022 17:35:04 +0200) 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:233823 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] > That's a regexp with a lot of backtracking, I think (i.e., elements that > can be matched both by the ?'s as well as the two *'s). So matching > this will be slow, which results in the hangs you're seeing when Emacs > is trying to match that to the text in the buffer. Would it make sense to say more about this point in the Emacs Lisp Manual where it describes regexps? -- Dr Richard Stallman (https://stallman.org) Chief GNUisance of the GNU Project (https://gnu.org) Founder, Free Software Foundation (https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)