Issue #13016 has been updated by Akira Tanaka. Ruby has enough feature to implement String#hsub as Martin-sensei said. However the performance of String#hsub is not good because it creates regexp object each time. I guess creating regexp for big table each time is not acceptable for most cases. ---------------------------------------- Feature #13016: String#gsub(hash) https://bugs.ruby-lang.org/issues/13016#change-62577 * Author: Shyouhei Urabe * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Background: I wanted to drop NKF dependency of my script. By doing so I noticed that I can't purge `NKF.nkf '-Z4'`. It can neither be rewritten using String#tr, String#encode, nor String#unicode_normalize. It is doable using String#gsub theoretically, but that requires a hand-crafted nontrivial regular expression that exactly matches what Z4 expects to convert. This is almost impossible to do, and is definitely not something debuggable. Proposal: extend String#gsub so that it also accepts hash as its only argument, specifying input-output mapping. ```ruby # now def convert str require 'nkf' NKF.nkf '-Z4xm0', str end # proposed def convert str map = { "\u3002" => "\uFF61", "\u300C" => "\uFF62", ... } str.gsub map end ``` -- https://bugs.ruby-lang.org/ Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>