From: Brian Candler <b.candler@...>
Date: 2010-09-08T20:15:31+09:00
Subject: Re: Regex breaks when string contains binary data

Aisha Fenton wrote:
> Hi Brian,
> Output those IRB statements for me is:
...
>> RUBY_DESCRIPTION
=> "ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]"
...
>>> "\345HI" =~ /HI|BYE/
> => nil
>>> "\345HI".bytes.to_a
> => [229, 72, 73]

Hmm. What does $KCODE show? I can reproduce your problem if I turn it 
on.

$ irb --simple-prompt
>> "\345HI" =~ /HI|BYE/
=> 1
>> $KCODE
=> "NONE"

$ irb -Ku --simple-prompt
>> "\345HI" =~ /HI|BYE/
=> nil
>> "345HI" =~ /HI|BYE/
=> 3
>> $KCODE
=> "UTF8"

Do you have something in RUBYOPT environment variable? (echo $RUBYOPT)
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