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: AS24940 94.130.0.0/16 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 [94.130.110.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 339F41F61A for ; Mon, 12 Dec 2022 00:56:59 +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="YSMkPDNx"; dkim-atps=neutral Received: from nue.mailmanlists.eu (localhost [127.0.0.1]) by nue.mailmanlists.eu (Postfix) with ESMTP id 2D0867E56D; Mon, 12 Dec 2022 00:56:40 +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=YSMkPDNx; dkim-atps=neutral Received: from xtrwkhkc.outbound-mail.sendgrid.net (xtrwkhkc.outbound-mail.sendgrid.net [167.89.16.28]) by nue.mailmanlists.eu (Postfix) with ESMTPS id 2E3157E4CC for ; Mon, 12 Dec 2022 00:56:33 +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=O3Ek2FfEDsdUEBWr2q9Tq7bF22dzIdiRJrfQYZUtmfg=; b=YSMkPDNxiVkuo7XSTeGa1PfKWnVah4Py2kT427YBeGMWjLEm0vj/TUMqa+eSIzIJml2V TPAHR/GPiXWwD8j+1uAaJKW9HeIhSfCLikul0JWhMVjmIIr1FbAPLbYd0VJkraGr6O5r44 y6/n1YqHJLtN7tERDCIBvsZPRNi77Kk1ex3DfPkTH9jO8dTcmxMr3QcweUu/oq17waofeu TJC+gNKYGiylKIPB9b57gfTuXQLHgTOaS+/xGXZrF3Tr8T/hmMK3It7ck2GcSb9SDEZBuy MsS60kpa336PimZf2DnW3+QAnI0SXipSRKERzc1vx5dEOMK/e3mi0uARcpKGYkJQ== Received: by filterdrecv-6b9548745c-gplqn with SMTP id filterdrecv-6b9548745c-gplqn-1-63967C3F-25 2022-12-12 00:56:31.806064358 +0000 UTC m=+2080103.337551374 Received: from herokuapp.com (unknown) by geopod-ismtpd-3-0 (SG) with ESMTP id CtfZJ2dbRveWIMgYbH7guA for ; Mon, 12 Dec 2022 00:56:31.756 +0000 (UTC) Date: Mon, 12 Dec 2022 00:56:31 +0000 (UTC) From: "mame (Yusuke Endoh)" 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: mame 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: 87613 X-SG-EID: =?us-ascii?Q?YbSlef6ZOa=2FS=2FuqSxXRzl42MttQDxKOujGe43WuBjI7JKMg2OkmRsyzG5za6L9?= =?us-ascii?Q?e1flZkYZ9OViVy5Lc4acvpZgLFouzPC8oxOTF1e?= =?us-ascii?Q?V6jJQmMvpeI=2F6RXF083IurP5ZEYkObB3dSkZ84N?= =?us-ascii?Q?iUvKtJFxjniXmgjy=2F7oZRSXGDuLQyfyLoYUALNS?= =?us-ascii?Q?56ZN+byHrQRqZ6V0067yzvE4fcvpg8lqzJB2fxN?= =?us-ascii?Q?dPLa02=2FSin1JY1VU4jqnugBhvJD7mVNOIIcWSAv?= =?us-ascii?Q?lCZ0n5D9lpKdoRbEUtRTw=3D=3D?= To: ruby-dev@ml.ruby-lang.org X-Entity-ID: b/2+PoftWZ6GuOu3b0IycA== Message-ID-Hash: NWK2G2S4GH4EPOZLJVPSVCFOCAYAZDG5 X-Message-ID-Hash: NWK2G2S4GH4EPOZLJVPSVCFOCAYAZDG5 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=3A52015=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 mame (Yusuke Endoh). @make_now just Thank you! I would like to propose @make_now_just as a committer. He has made a great improvement to the Regexp engine. Ruby's Regexp engine is in a state of its own fork from onigmo, and he is a valuable person who can maintain it. @matz What do you think? ---------------------------------------- Feature #19194: Add Regexp.linear_time? https://bugs.ruby-lang.org/issues/19194#change-100550 * 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/