Bug #2943: Regexp Hash Code Changes
http://redmine.ruby-lang.org/issues/show/2943

Author: Nathan Weizenbaum
Status: Open, Priority: Normal
ruby -v: ruby 1.8.7 (2009-04-08 patchlevel 160) [i686-linux]

When a Regexp containing a sub-section with the case-insensitivity flag set is matched against a string, its hash code changes.

re = /(?i:.)/
p re.hash #=> -452142835
"_" =~ re
p re.hash #=> 21933550


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