class String
  alias _match match
  def match(*args)
    m = _match(args.shift)
    if m && m.length > 1
      meta = (class << m; self; end)
      args.each_with_index do |name, index|
        meta.send(:define_method, name) { self[index+1] }
      end
    end
    m
  end
end

m = "12:34:56".match(/(\d+):(\d+):(\d+)/, :hour, :minute, :second)
puts m.hour
puts m.minute
puts m.second