From: Brian Candler <b.candler@...>
Date: 2010-05-10T22:58:27+09:00
Subject: Re: Issue with regular expressions and locales

Emili Parre単o wrote:
> In my local system I get this
> 
> "多" =~ /\W/
> => 0
> 
> but in another systems with english locale I have this other result
> 
> "多" =~ /\W/
> => nil
> 
> Is this a bug or regular expressions matching depends on system locale?

(1) What exact version(s) of Ruby are you running? (Show 
RUBY_DESCRIPTION constant). Behaviour varies between versions.

(2) What does

    "多".encoding

show on the two machines?

AFAIK the actual match should depend only on the encoding of the string, 
not the system locale in the environment - but if you find differently 
that would be of interest.

(3) It looks like you are doing this in IRB. IRB is not a good predictor 
of behaviour in ruby 1.9, since the encoding of string literals in IRB 
depends on the system locale - which is not true for ruby source code in 
source files.

So writing a small test .rb file and running that is probably better.

I've attempted to document what I've found so far about encoding 
behaviour in 1.9 here: 
http://github.com/candlerb/string19/blob/master/string19.rb
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