String regex = "^([A-Za-z]+://)"
	+ "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?"	// User.
	+ "(([0-9]{1,3}\\.){3}[0-9]{1,3}"							 	// IP.
	+ "|" 															// Allows either IP or domain.
	+ "([0-9A-Za-z_!~*'()-]+\\.)*" 									// Tertiary domain(s) - www.
	+ "([0-9A-Za-z][0-9A-Za-z-]{0,61})?[0-9A-Za-z]\\." 				// Second level domain.
	+ "[a-z]{2,6})" 												// First level domain- .com or .museum.
	+ "(:[0-9]{1,5})?" 												// Port number - :80
	+ "((/?)|" 														// A slash isn't required if there is no file name
	+ "(/[0-9A-Za-z_!~*'().;?:@&=+$,%#-]+)+/?)$";					// Page name.