From: "Nevir (Ian MacLeod)" Date: 2012-04-28T01:07:22+09:00 Subject: [ruby-core:44690] [ruby-trunk - Bug #4044] Regex matching errors when using \W character class and /i option Issue #4044 has been updated by Nevir (Ian MacLeod). One additional note is that this only seems to occur when \W is in a character group: ��� ruby -ve '("a".."z").each {|ch| p(/\W/i.match(ch)) }' ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin12.0.0] nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ---------------------------------------- Bug #4044: Regex matching errors when using \W character class and /i option https://bugs.ruby-lang.org/issues/4044#change-26259 Author: ben_h (Ben Hoskings) Status: Feedback Priority: Normal Assignee: naruse (Yui NARUSE) Category: core Target version: 1.9.2 ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0] =begin Hi all, Josh Bassett and I just discovered an issue with regex matches on ruby-1.9.2p0. (We reduced it while we were hacking on gemcutter.) The case-insensitive (/i) option together with the non-word character class (\W) match inconsistently against the alphabet. Specifically the regex doesn't match properly against the letters 'k' and 's'. The following expression demonstrates the problem in irb: puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[^\W]/i] ].inspect } As a reference, the following two expressions are working properly: puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[^\W]/] ].inspect } puts ('a'..'z').to_a.map {|c| [c, c.ord, c[/[\w]/i] ].inspect } Cheers Ben Hoskings & Josh Bassett =end -- http://bugs.ruby-lang.org/