JavaScript Regular Expression Email Validation [duplicate]

Answer 1

You can add a function to String Object

//Add this wherever you like in your javascript code
String.prototype.isEmail = function() {
    return !!this.match(/^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$/);
}

var user_email = "test.email@example.com";

if(user_email.isEmail()) {
    //Email is valid !
} else {
    //Email is invalid !
}