From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#64128: regexp parser zero-width assertion bugs Date: Sun, 18 Jun 2023 23:04:49 -0400 Message-ID: References: <4A303177-384E-4FEF-98F2-FAB89A12ACC9@gmail.com> <83pm5tpdy2.fsf@gnu.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="16779"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Eli Zaretskii , Paul Eggert , 64128@debbugs.gnu.org To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jun 19 05:05:24 2023 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 1qB5Cm-000497-Aa for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 19 Jun 2023 05:05:24 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qB5CT-0002zW-EG; Sun, 18 Jun 2023 23:05:05 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qB5CQ-0002z7-Ox for bug-gnu-emacs@gnu.org; Sun, 18 Jun 2023 23:05:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qB5CQ-0001sP-GT for bug-gnu-emacs@gnu.org; Sun, 18 Jun 2023 23:05:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1qB5CP-0007to-T1 for bug-gnu-emacs@gnu.org; Sun, 18 Jun 2023 23:05:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 19 Jun 2023 03:05:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 64128 X-GNU-PR-Package: emacs Original-Received: via spool by 64128-submit@debbugs.gnu.org id=B64128.168714389930353 (code B ref 64128); Mon, 19 Jun 2023 03:05:01 +0000 Original-Received: (at 64128) by debbugs.gnu.org; 19 Jun 2023 03:04:59 +0000 Original-Received: from localhost ([127.0.0.1]:55327 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qB5CN-0007tV-HE for submit@debbugs.gnu.org; Sun, 18 Jun 2023 23:04:59 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:8265) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qB5CL-0007tG-2L for 64128@debbugs.gnu.org; Sun, 18 Jun 2023 23:04:57 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 700D3441DA1; Sun, 18 Jun 2023 23:04:51 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 43B21441D6D; Sun, 18 Jun 2023 23:04:50 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1687143890; bh=VW1hFchXSZb96oGF7QTnazp3iCBwuWrZ3J4vA6/gInc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=PskoKwOl6xbKuk0KjecZa6hOq5GvO7L0ouvIgeaaawKqrGDsZKW4V8rFhSSUnzZ7O bXoDTo5siGMGYkhqJ28cMlEdgBzcBa4DZy8mZ/efv9MacnVzxUVbv9b4B5uQy2Lpme +Sms6njbAZsxkoMyMQdOirvlVokfWdqMhB/6fGh4VCTiBlNW/Plh8TrIjk77pczh3/ w3KNxy7WSKrH6OIa2bw0xcb68f/VyHLJWEekK5is05D1J6Z8K6G/AfFYb7h0IGCOoA DzeLGfVenMkZTSEnIoGy7h76FW7Q5zLgy1nVSdc772C11xhsM60lEqI3jrYs5ubSX6 lUaaSWkEoXVDw== Original-Received: from pastel (unknown [45.72.207.87]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id F1FC212094B; Sun, 18 Jun 2023 23:04:49 -0400 (EDT) In-Reply-To: ("Mattias =?UTF-8?Q?Engdeg=C3=A5rd?="'s message of "Sun, 18 Jun 2023 22:26:28 +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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:263668 Archived-At: > To make everything clear, we have to groups of zero-width assertions: > > Group A: ^ $ \` \' \b \B IIRC `^` is only special if it's at the beginning of a group, so `^*` will always treat this * as a literal, right? "Similarly" `$` is only special if it's at the end of a group, so `$*` will always be a repetition of the $ character no? So the remaining problematic elements are \` \' \b and \B I suspect if we don't want to signal errors, the next best thing is to treat them like group B. Stefan