Regular expression for Email validation

var email=document.getElementById("txtEmail").value;
var emailfilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/;
var illegalchars = /[\(\)\<\>\,\;\\\\"\[\]]/;

if (!emailfilter.test(email)) {
	    alert("Invalid email");
	    document.getElementById("txtEmail").focus();
	    return false;
	}
	else if (email.match(illegalchars)) {
	    alert("Invalid email address");
	    document.getElementById("txtEmail").focus();
	    return false;
	}
else
{
return true;
}