validate and parse URL

valid_url = new RegExp(
			"^" +
				"(?:" +
					// $1 protocol
					"([a-z\\u00a1-\\uffff0-9]+-?)?" +
					"(?:(?:\\:)?//)"+
					// $2 username:password
					"(?:((?:\\S*)(?::\\S*)?)@)?" +
					// $3 Hostname
					"("+
						"(?:(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}"+
						"(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"+
						"|"+
						"(?:(?:[a-z\\u00a1-\\uffff0-9]|[a-z\\u00a1-\\uffff0-9][a-z0-9\\u00a1-\\uffff\\-]*[a-z0-9\\u00a1-\\uffff])\\.)*"+
						"(?:[a-z\\u00a1-\\uffff]|[a-z\\u00a1-\\uffff][a-z0-9\\u00a1-\\uffff\\-]*[a-z0-9\\u00a1-\\uffff])"+
						"|"+
						"(?:"+
							"(?:(?:[0-9a-f]{1,4}:){7}(?:[0-9a-f]{1,4}|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){6}(?::[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){5}(?:(?:(?::[0-9a-f]{1,4}){1,2})|:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){4}(?:(?:(?::[0-9a-f]{1,4}){1,3})|(?:(?::[0-9a-f]{1,4})?:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){3}(?:(?:(?::[0-9a-f]{1,4}){1,4})|(?:(?::[0-9a-f]{1,4}){0,2}:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){2}(?:(?:(?::[0-9a-f]{1,4}){1,5})|(?:(?::[0-9a-f]{1,4}){0,3}:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))"+
							"|(?:(?:[0-9a-f]{1,4}:){1}(?:(?:(?::[0-9a-f]{1,4}){1,6})|(?:(?::[0-9a-f]{1,4}){0,4}:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))"+
							"|(?::(?:(?:(?::[0-9a-f]{1,4}){1,7})|(?:(?::[0-9a-f]{1,4}){0,5}:(?:(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))"+
						")"+
					")"+
					// $4 Port
					"(?::(\\d{2,5}))?" +
				")?" +
				// $5 Path
				"("+
					"(?:(?:[\\/])|(?:\\.{2})||(?:\\.{1})|(?:^[a-z\\u00a1-\\uffff]))" +
					"(?:[^\\?^#^:]*)" +
				")?" + 
				// $6 Query
				"(?:\\?([^\\#]+)*)?"+
				// $7 Hash
				"(?:\\#(\\S*))?"+
			"$", "i"
		);