Ruby Regexp Unescape

May not be a big deal to write it yourself...but I wrote this and was quite useful, where I had to do un-escaping of a Regex Pattern for some reasons...

class Regexp
  def unescape
    source = self.source.split('')
    escape_on = false
    unescaped_string = source.inject([]) {|r, char|
      if char == "\\" and escape_on == false
        escape_on = !escape_on
      else
        r << char
        escape_on = false
      end
      r
    }.join
  end
end