From: "Vincent L." <like.space@...>
Date: 2008-06-04T19:08:14+09:00
Subject: Re: instance_eval, regexp with block : losing $1

I finally managed to get it to work :

class Base
  def self.match(name, regexp, &block)
    define_method(name) do |text|
      puts "#{text}"
      text.gsub!(regexp) do
        #hack to restore magical $~ (and so $1, $2, etc.) in block
        eval('lambda{|x| $~ = x}', block).call($~)
        block.call #or instance_eval(&block)
      end
      puts "=> #{text}"
    end
  end
end

class Foo < Base
  match :g, /(.)g$/i do
    $1.upcase + '_ggg'
  end
end

f = Foo.new
f.g('bla')
f.g('doing')
-- 
Posted via http://www.ruby-forum.com/.