def match(path)
      new_path = path.gsub(@rx, '')
      Match.new(new_path) if path != new_path
    end
def match(path)
      new_path = path.gsub(@rx, '')
      Match.new(new_path) if path != new_path
    end
Creates a {RegexpMatcher}
 @param rx [Regexp] path specification regex
 @todo Support parameters based on named capture groups.
 Tries to match the actual path.
 @param path [String] the actual path from Rack env
 @return {Match} if the beginning of path does match or nil if there is
 no match.