parseNumeric

 //Numeric.RPL_KEYVALUE
	import std.range : only, takeNone;
	import virc.common : User;

	with(parseNumeric!(Numeric.RPL_KEYVALUE)(only("someone!test@example.com", "url", "*", "http://www.example.com"), "@", "#").get) {
		assert(target== User("someone!test@example.com"));
		assert(key == "url");
		assert(visibility == "*");
		assert(value == "http://www.example.com");
	}

	assert(parseNumeric!(Numeric.RPL_KEYVALUE)(takeNone(only("")), "@", "#").isNull);
	assert(parseNumeric!(Numeric.RPL_KEYVALUE)(only("*"), "@", "#").isNull);
	assert(parseNumeric!(Numeric.RPL_KEYVALUE)(only("*", "url"), "@", "#").isNull);

	with(parseNumeric!(Numeric.RPL_KEYVALUE)(only("*", "url", "*"), "@", "#").get) {
		assert(target == "*");
		assert(key == "url");
		assert(visibility == "*");
		assert(value.isNull);
	}