Email validation with Javascript; every email appears to be invalid

Question

I'm having trouble validating email addresses with JS. Here is my code:

var regEmail = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/i;
var result = regEmail.test('username');
alert(result);

So no matter what kind of email address I type, it always shows "false". I copied the regex expression from somewhere on stackoverflow, but I think it should actuylly work...

EDIT

$(document).ready(function() {

        $('#submitBtn').click(function() {

        //Überprüfe ob der Benutzername leer ist
        var username = $('#username').val();
        if (username == ""){
            alert ("User name cannot be empty!");
        }

        //Email validation

        var regEmail = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/i;
        var result = regEmail.test('[email protected]');
        alert(result);

        });
    });

This returns true: [`var result = regEmail.test('[email protected]');`](http://jsfiddle.net/pjLkncpw/). — Wiktor Stribiżew, Sep 15 '15 at 09:11
Like almost every other regex for email validation, that one disallows perfectly valid addresses. Validation beyond "is there at least one character either side of an `@`?" is usually a waste of time. Send to the address, have the user verify they got the message. — T.J. Crowder, Sep 15 '15 at 09:14
@alina: *"I just tested it... it shows false"* No, it doesn't: http://jsfiddle.net/ygd1y1at/ — T.J. Crowder, Sep 15 '15 at 09:16
then what the hell is wrong with my code... I just tested it (I made a form) and it shows "false" all the time... I must be doing something wrong, I just dont know what — milami, Sep 15 '15 at 09:19
@alina, post complete code, obviously - problem is somewhere else... — sinisake, Sep 15 '15 at 09:20
You are probably using wrong selector for email field. Re-check your HTML.... or, post your form html here.... http://jsfiddle.net/nkk1k084/ it works fine.... — sinisake, Sep 15 '15 at 09:29

slashsharp · Answer 1 · 2015-09-15T09:14:18.283

-2

You're passing only a single string without matching the regex rules.

edited Sep 15 '15 at 09:14

answered Sep 15 '15 at 09:12

slashsharp

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missing `_` and `.` and `+` and `-` – Hacketo Sep 15 '15 at 09:13

Email validation with Javascript; every email appears to be invalid

1 Answers1