From: "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>
Date: 2013-11-07T21:50:11+09:00
Subject: [ruby-core:58217] [ruby-trunk - Bug #4044] Regex matching errors	when using \W character class and /i option


Issue #4044 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


Shouldn't this bug be mentioned in the docs for \W in the Regexp documentation?

http://www.ruby-doc.org/core-2.0.0/Regexp.html

People would like to be aware of it until it's fixed.
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Bug #4044: Regex matching errors when using \W character class and /i option
https://bugs.ruby-lang.org/issues/4044#change-42799

Author: ben_h (Ben Hoskings)
Status: Feedback
Priority: Normal
Assignee: naruse (Yui NARUSE)
Category: core
Target version: next minor
ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]
Backport: 


=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



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