From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: X-Spam-Status: No, score=-2.9 required=3.0 tests=AWL,BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_BL_SPAMCOP_NET,SPF_HELO_PASS, SPF_PASS,UNPARSEABLE_RELAY shortcircuit=no autolearn=no autolearn_force=no version=3.4.2 Received: from nue.mailmanlists.eu (nue.mailmanlists.eu [IPv6:2a01:4f8:1c0c:6b10::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 3000A1F61A for ; Mon, 12 Dec 2022 02:07:18 +0000 (UTC) Authentication-Results: dcvr.yhbt.net; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ruby-lang.org header.i=@ruby-lang.org header.b="nTQc0IT/"; dkim-atps=neutral Received: from nue.mailmanlists.eu (localhost [127.0.0.1]) by nue.mailmanlists.eu (Postfix) with ESMTP id 4078E7E590; Mon, 12 Dec 2022 02:07:06 +0000 (UTC) Authentication-Results: nue.mailmanlists.eu; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ruby-lang.org header.i=@ruby-lang.org header.a=rsa-sha256 header.s=s1 header.b=nTQc0IT/; dkim-atps=neutral Received: from o1678948x4.outbound-mail.sendgrid.net (o1678948x4.outbound-mail.sendgrid.net [167.89.48.4]) by nue.mailmanlists.eu (Postfix) with ESMTPS id 61E887E579 for ; Mon, 12 Dec 2022 02:07:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ruby-lang.org; h=from:references:subject:mime-version:content-type: content-transfer-encoding:list-id:to:cc:content-type:from:subject:to; s=s1; bh=FjXGCU8/izYwI1MxG1vzeFz2ArvsKb0kgpp+x8ap1h4=; b=nTQc0IT/flIz9BK+rQbLAWELVPT5qrnY9weJRvdXpup1iHUqhoowHEZcGKFW4O6QeiGV 8z/Kw4BOR2mcG1PuF5NuDnfW/rB32qXSCfazCHN+Yb09XyNXd4E5a/NDjb/mMe9xShqqGn YzzpS+mwMzcVz98/NTb/ReUUpqI2QAHSXpJa+2pYFV67/hercxvHKI0Qi8AZJltgP7Nxwc lG8dxe+36iisz3km4VqgeNsKlAlpCdgxBdoIoKrpKGHGLJSGHKCflVcBlpdMNynicwP80x HYVFI7zN8IPxg79UFzaumRrTDRqHcYSdbxmfx0tVuS2ma8tBzZCdPE1yKdnN8+zA== Received: by filterdrecv-69c5db5cf4-5fd48 with SMTP id filterdrecv-69c5db5cf4-5fd48-1-63968CC3-5 2022-12-12 02:06:59.092082428 +0000 UTC m=+2084334.339442519 Received: from herokuapp.com (unknown) by geopod-ismtpd-2-0 (SG) with ESMTP id Y1DY4phIR6GGpldyyy4zlw for ; Mon, 12 Dec 2022 02:06:59.078 +0000 (UTC) Date: Mon, 12 Dec 2022 02:06:59 +0000 (UTC) From: "matz (Yukihiro Matsumoto)" Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Redmine-Project: ruby-master X-Redmine-Issue-Tracker: Feature X-Redmine-Issue-Id: 19194 X-Redmine-Issue-Author: make_now_just X-Redmine-Sender: matz X-Mailer: Redmine X-Redmine-Host: bugs.ruby-lang.org X-Redmine-Site: Ruby Issue Tracking System X-Auto-Response-Suppress: All Auto-Submitted: auto-generated X-Redmine-MailingListIntegration-Message-Ids: 87615 X-SG-EID: =?us-ascii?Q?SqOeWfVKFgkgw8cVgc6MYslIG5ZBbSbWU3opJ5u4yBsU3yWoizgPd1Pss4ZMTd?= =?us-ascii?Q?OLBRodnvQO26=2FFyqng1x72rdTkbmTHg5l1+yKA9?= =?us-ascii?Q?AQWjb4FEYHkrAIcreOLqXYvYtDk7zIKHTzobxbp?= =?us-ascii?Q?b5qDT7=2FGYu91XAcp84Qggt6ICGZexUBnAdQMzfJ?= =?us-ascii?Q?1MusJWsBQi3ypKgiri0j5ODlKl+B0yNV0jkWUR4?= =?us-ascii?Q?R4vLL17KOBevKwsolRenn5joVWAdtcWzVmauJWv?= =?us-ascii?Q?5OwtuLdCAVPVcabvmC68A=3D=3D?= To: ruby-dev@ml.ruby-lang.org X-Entity-ID: b/2+PoftWZ6GuOu3b0IycA== Message-ID-Hash: XBFPPGC7NPK6S5TUMOS4KHLPMD7G6PYA X-Message-ID-Hash: XBFPPGC7NPK6S5TUMOS4KHLPMD7G6PYA X-MailFrom: bounces+313651-12dc-ruby-dev=ml.ruby-lang.org@em5188.ruby-lang.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.3 Precedence: list Reply-To: "Ruby developers (Japanese)" Subject: =?utf-8?q?=5Bruby-dev=3A52017=5D_?= [Ruby master Feature#19194] Add Regexp.linear_time? List-Id: "Ruby developers (Japanese)" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Issue #19194 has been updated by matz (Yukihiro Matsumoto). Also accepted to nominate him a committer. Matz. ---------------------------------------- Feature #19194: Add Regexp.linear_time? https://bugs.ruby-lang.org/issues/19194#change-100552 * Author: make_now_just (Hiroya Fujinami) * Status: Open * Priority: Normal ---------------------------------------- I suggest adding a new method named `Regexp.linear_time?` to check if matching against a given regexp can be completed in linear time by the optimization introduced in #19104 (GitHub PR [#6486](https://github.com/ruby/ruby/pull/6486)). This method was discussed in #19104. I'm not sure the name is best. # Example ``` Regexp.linear_time?(/a/) # => true Regexp.linear_time?(/(a|a)*\1/) # => false, because this uses a back-reference. # This can accept a regexp source string and flags like `Regexp.new`. Regexp.linear_time?('a') # => true Regexp.linear_time?('a', Regexp::IGNORECASE) # => true ``` For example, this method is useful for implementing a Rubocop rule to check a regexp is ReDoS safe. # Implementation Implementation is done at GitHub PR [#6901](https://github.com/ruby/ruby/pull/6901). See the details there. -- https://bugs.ruby-lang.org/