From: "ged (Michael Granger)" <ged@...>
Date: 2013-02-27T08:03:06+09:00
Subject: [ruby-core:52963] [ruby-trunk - Bug #7974][Open] Case-insensitive group doesn't work in 2.0.0-p0


Issue #7974 has been reported by ged (Michael Granger).

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Bug #7974: Case-insensitive group doesn't work in 2.0.0-p0
https://bugs.ruby-lang.org/issues/7974

Author: ged (Michael Granger)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin12.2.1]


=begin

A match group marked as case-insensitive (({(?i:...)})) fails to match if it occurs before a case-sensitive portion of the regex.

Given the script:

 # -*- syntax: ruby -*-
 #encoding: utf-8
 
 # Doesn't match in Ruby 2.0, but does in 1.9.3
 p(/(?i:a) B/  =~ "A B")
 p(/(?i:a) B/  =~ "a B")
 
 # Matches in both versions
 p(/(?i:a) B/i =~ "a b")
 p(/(?i:a B)/  =~ "a B")
 p(/(?i:a b)/  =~ "a B")
 p(/B (?i:a)/  =~ "B A")
 p(/B (?i:a)/  =~ "B a")
 
All cases match in Ruby 1.9.3p392:

 $ ruby -v ~/temp/re_group_i.rb 
 ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin12.2.1]
 0
 0
 0
 0
 0
 0
 0
 
but the first two don't match under Ruby 2.0.0p0:

 $ ruby -v ~/temp/re_group_i.rb 
 ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin12.2.1]
 nil
 nil
 0
 0
 0
 0
 0
 
I expected both versions to implement case-insensitive groups the same way.

=end



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