From: Brian Candler <b.candler@...>
Date: 2008-11-05T23:28:16+09:00
Subject: Re: irb and ruby giving different results

Nit Khair wrote:
> in IRB,
> ASCII     = (0..255).map{|c| c.chr }
> PRINTABLE = ASCII.grep(/[[:print:]]/)
> PRINTABLE.length
>>>> 191
> 
> However, inside the ruby program PRINTABLE.length only gives 95 !! ???
> 
> #!/opt/local/bin/ruby
>  ASCII     = (0..255).map{|c| c.chr }
>  puts(ASCII.length)
>  PRINTABLE = ASCII.grep(/[[:print:]]/)
>  puts(PRINTABLE.length)
> # -> 95 instead of 191
> 
> (Using ruby 1.8.7 on OS X 10.5.5, powerpc). Ran both from same Terminal.
> Both use /opt/local/bin/ruby.
> 
> Why this difference?

FWIW, I get 95 with irb187 under Ubuntu Dapper.

Looking at source code, the [[:print:]] character class uses isascii(c) 
&& isprint(c)

man isprint says:

NOTE
       The  details  of  what characters belong into which class depend 
on the
       current locale.  For example, isupper() will not recognize an 
A-umlaut
       (Ä) as an uppercase letter in the default C locale.

So look at what ENV.grep(/^LC/) shows. You could try setting 
ENV['LC_ALL']='C' in irb, or export LC_ALL=C before running it. Or try 
'POSIX' instead of 'C'.

Finally, be completely sure that your irb is running the right ruby. 
Check RUBY_VERSION within irb.
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