parseNumeric

 //Numeric.RPL_WHOISKEYVALUE
	import virc.common : User;
	import std.range : only, takeNone;
	{
		with(parseNumeric!(Numeric.RPL_WHOISKEYVALUE)(only("someone!test@example.com", "url", "*", "http://www.example.com"), "@", "#").get) {
			assert(target.user == User("someone!test@example.com"));
			assert(key == "url");
			assert(visibility == "*");
			assert(value == "http://www.example.com");
		}
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_WHOISKEYVALUE)(takeNone(only("")), "@", "#");
		assert(logon.isNull);
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_WHOISKEYVALUE)(only("*"), "@", "#");
		assert(logon.isNull);
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_WHOISKEYVALUE)(only("*", "url"), "@", "#");
		assert(logon.isNull);
	}
	{
		immutable logon = parseNumeric!(Numeric.RPL_WHOISKEYVALUE)(only("*", "url", "*"), "@", "#");
		assert(logon.isNull);
	}