Validate Email For A Specific Domain

Validate Email For A Specific Domain

I am trying to get this to work without any success
https://forum.jquery.com/topic/validating-multiple-domain-email-addresses-which-a-form

If anyone has a working example, I would greatly appreciate any assistance. I can not even begin to describe how many hours I have put into this without success. Any help is appreciated...

<script src=" http://code.jquery.com/jquery-1.8.3.min.js" type="text/javascript"></script>

<script src=" http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/jquery.validate.js" type="text/javascript"></script>
<script>
$().ready(function() {
        // validate the comment form when it is submitted
        $("#commentForm").validate();

        // validate signup form on keyup and submit
        $("#helpdeskform").validate({
            rules: {
                name: "required",
                name: {
                    required: true,
                    minlength: 2
                },
                password: {
                    required: true,
                    minlength: 5
                },
                confirm_password: {
                    required: true,
                    minlength: 5,
                    equalTo: "#password"
                },
                email: {
                    required: true,
                    email: true,
                    matches: '.+@domain.edu'
                },
                topic: {
                    required: "#newsletter:checked",
                    minlength: 2
                },
                agree: "required"
            },
            messages: {
                name: {
                    required: "Please enter a username",
                    minlength: "Your username must consist of at least 2 characters"
                },
                password: {
                    required: "Please provide a password",
                    minlength: "Your password must be at least 5 characters long"
                },
                confirm_password: {
                    required: "Please provide a password",
                    minlength: "Your password must be at least 5 characters long",
                    equalTo: "Please enter the same password as above"
                },
                email: {
                required: "Please enter a valid email address",
                },
                agree: "Please accept our policy"
            }
        });

    </script>