Question

$.validator.addMethod('username', function (value) {
    return [A-Za-z0-9\-\_]+.test(value);
}, 'Username can only contain letters, numbers, underscores and dashes.');

I am no good with regular expressions OR jQuery/JavaScript which makes this almost impossible for me.

I simply want to add a method to validate a username to make sure it only has numbers, letters, underscores, and dashes (no spaces, periods, etc) but I can’t seem to get it right.

Any help would be appreciated.

Answer 1

There are two problems here. One, the regex needs delimiters. Two, the regex does not check whether the whole string is made up of those letters:

var regex = /^[\w-]+$/;
return regex.test(value);

I also shortened the regex a bit (the character class is the same).