From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS4713 221.184.0.0/13 X-Spam-Status: No, score=-3.0 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS,T_DKIM_INVALID, T_RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by dcvr.yhbt.net (Postfix) with ESMTP id E129A1FA7B for ; Fri, 16 Jun 2017 14:23:44 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id CD63E1207EB; Fri, 16 Jun 2017 23:23:42 +0900 (JST) Received: from o1678916x28.outbound-mail.sendgrid.net (o1678916x28.outbound-mail.sendgrid.net [167.89.16.28]) by neon.ruby-lang.org (Postfix) with ESMTPS id 32A7A1207E1 for ; Fri, 16 Jun 2017 23:23:40 +0900 (JST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=sendgrid.me; h=from:to:references:subject:mime-version:content-type:content-transfer-encoding:list-id; s=smtpapi; bh=r4/tz67s7dlp98c4RdBz05tyuN8=; b=hG1Qy70QqcVrNsCjqB wTSLYMgm2WGGZmjG/5sLkJsU3eUgl/r0YceKWFJUeOEk7OyNXfybuBoDXJDJBqlP j0at2TNJT7fEF1p2b9lH7+AvocHy7Lu2/elbUteF7cO5vy6wOP2RHPKbjwbnsCIA uOzNucxHlTny56e9D8mB/wq5w= Received: by filter1120p1mdw1.sendgrid.net with SMTP id filter1120p1mdw1-10533-5943E9EA-27 2017-06-16 14:23:38.463012619 +0000 UTC Received: from herokuapp.com (ec2-54-166-169-114.compute-1.amazonaws.com [54.166.169.114]) by ismtpd0005p1iad1.sendgrid.net (SG) with ESMTP id nvswiWEvTXyctVhx1Aujdw for ; Fri, 16 Jun 2017 14:23:38.366 +0000 (UTC) Date: Fri, 16 Jun 2017 14:23:38 +0000 From: sonots@gmail.com To: ruby-core@ruby-lang.org Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 56742 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 12694 X-Redmine-Issue-Author: sonots X-Redmine-Sender: sonots 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-SG-EID: ync6xU2WACa70kv/Ymy4QrNMhiuLXJG8OTL2vJD1yS55QTDO5VFMUa6BJwIBXFezBFPtB75VQiidGc kwIuNF+YKTRRCMoG7elQs1jiFGzErjJ/2eJ1/sWTT7iYPNAc+2VkdWenOFXrczg53FAkAE0eFs88GJ 7Xt6KJv46CXbHovlDbJxqc6vZMEQpku2qlFzdW6HPnXl8AzL3CVvl9DuHA== X-ML-Name: ruby-core X-Mail-Count: 81713 Subject: [ruby-core:81713] [Ruby trunk Feature#12694] Want a String method to remove heading substr X-BeenThere: ruby-core@ruby-lang.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Ruby developers List-Id: Ruby developers List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #12694 has been updated by sonots (Naotoshi Seo). We have String#chomp to delete suffix, but it would be nice to have the method for symmetry. I will create another thread to discuss about it. ---------------------------------------- Feature #12694: Want a String method to remove heading substr https://bugs.ruby-lang.org/issues/12694#change-65411 * Author: sonots (Naotoshi Seo) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- I often write codes like: ```ruby str = 'abcdef' substr = 'abc' str[substr.size..-1] if str.start_with?(substr) #=> 'def' # or str.sub(/\A#{Regexp.escape(substr)}/, '') #=> 'def' ``` I want a short hand which is something like: ```ruby str = 'abcdef' substr = 'abc' str.lstrip(substr) #=> 'def' ``` Having similar argument for `String#rstrip` would be nice for symmetry although we already have `String#chomp(substr)` My frequent use-case is coming from fluentd. We have `remove_tag_prefix` option to remove a heading substring from a tag. We currently using `String#sub` with a regular expression, but I feel regular expression matching is too much just to remove a heading substring. https://github.com/fluent/fluentd/blob/75005f18d48ed3d416890413fa5f83982b264c71/lib/fluent/compat/handle_tag_name_mixin.rb#L45 -- https://bugs.ruby-lang.org/