Email Address Validation Using Regular Expression

The function given below is provided as an example of using regular expressions in Javascript to validate an email address.

function validateEmail(form) {
    //Validating the email field
    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 (! form.Email.value.match(re)) {
        alert("Invalid email address");
        form.Email.focus();
        form.Email.select();
        return (false);
    }
    return(true);
}