From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Fixing ill-conditioned regular expressions. Proof of concept. Date: Thu, 26 Feb 2015 08:46:22 -0500 Message-ID: References: <20150223181205.GA2861@acm.fritz.box> <54EB85AC.1030800@cs.ucla.edu> <20150223202114.GB2861@acm.fritz.box> <54EBA757.5030901@cs.ucla.edu> <20150223224245.GC2861@acm.fritz.box> <54EBB9C4.1020505@cs.ucla.edu> <20150225100834.GA3502@acm.fritz.box> <54EEDD82.4010502@cs.ucla.edu> <20150226101137.GA19320@acm.fritz.box> <87fv9tc4qm.fsf@gnu.org> <20150226130917.GC19320@acm.fritz.box> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1424958401 21357 80.91.229.3 (26 Feb 2015 13:46:41 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 26 Feb 2015 13:46:41 +0000 (UTC) Cc: Paul Eggert , emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Feb 26 14:46:32 2015 Return-path: Envelope-to: ged-emacs-devel@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 1YQylr-0001Wm-AV for ged-emacs-devel@m.gmane.org; Thu, 26 Feb 2015 14:46:31 +0100 Original-Received: from localhost ([::1]:59068 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQylq-00068j-Nv for ged-emacs-devel@m.gmane.org; Thu, 26 Feb 2015 08:46:30 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:60339) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQyln-00064d-OK for emacs-devel@gnu.org; Thu, 26 Feb 2015 08:46:28 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YQylj-0005qC-Oc for emacs-devel@gnu.org; Thu, 26 Feb 2015 08:46:27 -0500 Original-Received: from ironport2-out.teksavvy.com ([206.248.154.181]:8088) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQylj-0005q5-Kq for emacs-devel@gnu.org; Thu, 26 Feb 2015 08:46:23 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArsTAPOG1lRsoXmY/2dsb2JhbABbgwaDX4VTwGUEAgKBDUQBAQEBAQF8hA0BBAFWIwULCw4mEhQYDSSIOAjOIwEBAQcBAQEBHo94B4QqBYonn0uBRSKEDCCCcwEBAQ X-IPAS-Result: ArsTAPOG1lRsoXmY/2dsb2JhbABbgwaDX4VTwGUEAgKBDUQBAQEBAQF8hA0BBAFWIwULCw4mEhQYDSSIOAjOIwEBAQcBAQEBHo94B4QqBYonn0uBRSKEDCCCcwEBAQ X-IronPort-AV: E=Sophos;i="5.09,536,1418101200"; d="scan'208";a="111533954" Original-Received: from 108-161-121-152.dsl.teksavvy.com (HELO pastel.home) ([108.161.121.152]) by ironport2-out.teksavvy.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 26 Feb 2015 08:46:22 -0500 Original-Received: by pastel.home (Postfix, from userid 20848) id 2A82B136E; Thu, 26 Feb 2015 08:46:22 -0500 (EST) In-Reply-To: <20150226130917.GC19320@acm.fritz.box> (Alan Mackenzie's message of "Thu, 26 Feb 2015 13:09:18 +0000") 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: 206.248.154.181 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:183512 Archived-At: > I think that's true. There might be a slight problem with groups which > match only the empty string. Something like: > R*\(\)R* > , but anybody who writes such regexps deserves what she gets. What is it that I deserve to get? Stefan