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) server-digest SHA256) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 78D7A1F61A for ; Sun, 11 Dec 2022 05:54:57 +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="oh4o5UKs"; dkim-atps=neutral Received: from nue.mailmanlists.eu (localhost [127.0.0.1]) by nue.mailmanlists.eu (Postfix) with ESMTP id C3CA27E596; Sun, 11 Dec 2022 05:54:42 +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=oh4o5UKs; 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 B13987E4EC for ; Sun, 11 Dec 2022 05:54:35 +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=Ihy2v0pbd86ekoDkFLxFqgkf2jKcH7RYf4y9t0/MHxM=; b=oh4o5UKsmQ1/Pr5gnpbAMxE9OQhXEnQX0cmXS0+Bq11hoTTBn28NokY8b9qjnjg8OhpP Uku7qOxGhzIarpM8v5XcrJHe8+yNz+9UAmHTW3T3l8AmvHlVigPJ8qCLBv7W4fJd/ZVCCg +yzIE5UH2E05NEmxa3N3YTJj+emH9EFN+oRJ0i2qHd7uPV+DecF9ZqBMcO5PE+ta8xjZjd ULDCF33pSkvwOmYI9KtmVFsJm3ZM3evN/yL+MLDfWPxQO/RVH5cPKwyezoihp8DUXOCqWz 64Sdx+/Nt43c8gdpwT8zkQYJ5KRLr8w0isPqfJImQUar/cb+NsHH0EY0fSIvMsWw== Received: by filterdrecv-6b9548745c-dzhl2 with SMTP id filterdrecv-6b9548745c-dzhl2-1-6395709A-7 2022-12-11 05:54:34.229289581 +0000 UTC m=+2011577.463178040 Received: from herokuapp.com (unknown) by geopod-ismtpd-3-3 (SG) with ESMTP id hFJJBdOORCW4X0Y1d8wS7Q for ; Sun, 11 Dec 2022 05:54:34.219 +0000 (UTC) Date: Sun, 11 Dec 2022 05:54:34 +0000 (UTC) From: "make_now_just (Hiroya Fujinami)" 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: make_now_just 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: 87610 X-SG-EID: =?us-ascii?Q?Kh8XFMPV1KnUqUQrkUjUrG9nrcIWmiM7CXXXazBWRPTQB8k+yGI3L2yzhjzxBd?= =?us-ascii?Q?0OqfHqdoDS2SkITeDABTZo6iXbLUyh=2F9+lWTcfs?= =?us-ascii?Q?4=2F7OeEuhY94VGvAzMywANcO0B=2Fzpuz368CLL1rj?= =?us-ascii?Q?rQu9wlZLFWV=2FBMQ+ZzKZbBACvd7QKfPWS085+y7?= =?us-ascii?Q?XQKhoaMKPnXvHQwm9vTofpr4KCgOprT=2FV02Aung?= =?us-ascii?Q?CvOQa3bjt74gricbtMwC8h9fJRFP9N6EyL9f4US?= =?us-ascii?Q?k4tAXHOtd3bH6o50kp2EQ=3D=3D?= To: ruby-dev@ml.ruby-lang.org X-Entity-ID: b/2+PoftWZ6GuOu3b0IycA== Message-ID-Hash: Z477OME54OWVZ6ITSNJA4GCT75YLTXKR X-Message-ID-Hash: Z477OME54OWVZ6ITSNJA4GCT75YLTXKR 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=3A52014=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 reported by make_now_just (Hiroya Fujinami). ---------------------------------------- Feature #19194: Add Regexp.linear_time? https://bugs.ruby-lang.org/issues/19194 * 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/