ahah! makes perfect sense. I thought interpolation in ruby using that
construct was for double quoted strings. and since it worked in irb I
was confused.
I'm not at a machine now so I can't test your suggestion but I'll
assume its correct.

thanks a lot for the help!



On 1/12/08, Phrogz <phrogz / mac.com> wrote:
> On Jan 12, 4:39 pm, louis <louisju... / gmail.com> wrote:
> > user_variable = 'some_word' # retrieved from 'gets.chomp'
> > cleaned_variable = '^' + user_variable + '|\s' + user_variable + '(?!\w)'
> >
> > # print out variable to see if concat worked:
> > puts cleaned_variable  #=> prints out correct regex
> >
> > p some-sentence-string.gsub(%r{cleaned_variable},'TEST') # => prints
> > out sentence unchanged
>
> %r{foo} is the same as /foo/...you're using the name of the variable,
> not the contents. You want:
> /#{foo}/ or %r{#{foo}} or %r|#{foo}| or ...
> or Regexp.new( foo )
>
>