Backport #7974: Case-insensitive group doesn't work in 2.0.0-p0

• Status: Closed
• Assignee: nagachika (Tomoyuki Chikanaga)

[ged (Michael Granger)]

=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

[ged (Michael Granger)]

• File re_group_i.rb re_group_i.rb added

Updated version of test case script with better comments

[naruse (Yui NARUSE)]

• Status changed from Open to Closed

Fixed at r39547, thanks!

[nagachika (Tomoyuki Chikanaga)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport200
• Status changed from Closed to Assigned
• Assignee set to nagachika (Tomoyuki Chikanaga)

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r39953.
Michael, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 39547: [Backport #7972] [Backport #7974]

* Merge Onigmo 0fe387da2fee089254f6b04990541c731a26757f
  v5.13.3 [Bug#7972] [Bug#7974]