On Thu, May 8, 2008 at 6:07 PM, ara.t.howard <ara.t.howard@[...].com>  wrote:
> 
>  On May 8, 2008, at 3:40 PM, Todd Benson wrote:
> >
> > This question arises out of a couple of recent threads and may or may
> > not be a Ruby-specific question.
> >
> > I can check with a character class if one of the characters in the
> > class exists or does not exist, but can I use a regexp to check if a
> > string absolutely contains all of the characters in the class?
> >
> > Using a set perspective, I can do it like this in irb...
> >
> > s1 = "hello there"
> > s2 = "ohi"
> > (s2.unpack('c*') & s1.unpack('c*')).size == s2.size
> >
> > => false
> >
> > I use unpack to avoid creating a bunch of String objects, one for each
> > element in the array, which would happen if I used #split.  What I'm
> > wondering is if there is a way to do this with a simple regexp.
> >
> > Thanks,
> > Todd
> 
>  cfp:~ > cat a.rb
>  class String
>   def all_chars? chars
>     tr(chars, '').empty?
>   end
>  end
> 
>  p 'foobar'.all_chars?('rabof')
>  p 'foobar'.all_chars?('abc')
>  p 'foobar'.all_chars?('')
> 
> 
> 
>  cfp:~ > ruby a.rb
>  true
>  false
>  false

Cool :)  #tr is one of those useful methods I somehow consistently forget about.

tkx fur realizashuns,
Todd