check_to

# File lib/uri/mailto.rb, line 164
    def check_to(v)
      return true unless v
      return true if v.size == 0

      if parser.regexp[:OPAQUE] !~ v || /\A#{MAILBOX_PATTERN}*\z/ !~ v
        raise InvalidComponentError,
          "bad component(expected opaque component): #{v}"
      end

      return true
    end