jQuery email validation and Kissmetrics

email.js

            function isEmail(email) {
                var regex = /^([a-zA-Z0-9_\.\-\+])+\@@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
                return regex.test(email);
            }

            $("#validate-form").submit(function (event, dontCheck) {

                $email = $('#email');
                $form = $('#validate-form');
                var email = $email.val();

                if (!isEmail(email)) {
                    $email.addClass('has-error');
                    return false;
                }

                if (dontCheck === true) return;
                $.ajax({
                    url: "/validate",
                    data: $(this).serialize(),
                    success: function (data) {
                        if (data.valid) {
                            console.log('data is valid...triggering submit');
                            $("#validate-form").trigger("submit", true);
                        } else {
                            $("#info").text(data.message);
                        }
                    }
                });
                event.preventDefault();
            });

            $.ajax = function (settings) {
                if (!settings) return;
                console.log('starting setTimeout');
                setTimeout(function () {
                    var resp = {
                        "valid": true,
                        "message": ""
                    };
                    var email = $email.val();
                    _kmq.push(['identify', email]);
                    _kmq.push(['record', 'Signed Up for Beta']);
                    if (settings.success) settings.success(resp);
                }, 5000);
            };