From: "Mauricio Fernández" <mfp@...>
Date: 2005-11-09T07:00:00+09:00
Subject: Re: String#match shim for Ruby 1.6

On Wed, Nov 09, 2005 at 04:02:12AM +0900, Bil.Kleb@gmail.com wrote:
> I got the '::' from the IO.read that ts gave me.
> 
> So, then my question becomes, can I create
> a shim for 1.8's String#match with pure Ruby?

I fear the closest you can get would be

    class String
      def match(re,&b)   
	r = re.match(self)
	eval("lambda{|m| $~ = m}", b).call($~)
	r
      end
    end

    "foo".match(/foo/)    # => #<MatchData:0xb7d1f220>
    $&                    # => nil
    RUBY_VERSION          # => "1.6.8"

Of course, you can also use Florian's Binding.of_caller to get the environment
of the caller and substitute it in the eval, but callcc is expensive [even my
my variant, which doesn't use it, is quite expensive and you can only have a
trace_func at a time...].

-- 
Mauricio Fernandez