Javascript Test if string is a valid email address

gistfile1.txt

var email = '[email protected]';
var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
if (re.test(email) == false || re.test(email) == '') {
	alert("Bad or Missing Email Address");
}