validation.js

stanceApp.directive('ccNumberValidator', function () {
    /*
        ^(?:4[0-9]{12}(?:[0-9]{3})?          # Visa
         |  5[1-5][0-9]{14}                  # MasterCard
         |  3[47][0-9]{13}                   # American Express
         |  6(?:011|5[0-9]{2})[0-9]{12}      # Discover
        )$
    */
    return {
        require: 'ngModel',
        link: function ($scope, element, attrs, ngModel) {
            ngModel.$validators.ccNumber = function (v) {
                if (!angular.isUndefined(v) && v) {
                    var cardNumber = String(v).replace(/[ -]/g, '');
                    var valid = /^(?:4[0-9]{2,12}(?:[0-9]{3})?|5[1-5][0-9]{2,14}|3[47][0-9]{2,13}|6(?:011|5[0-9]{2})[0-9]{2,12})$/.test(cardNumber);
                    ngModel.$setDirty(valid);
                }
                return v;
            };
        }
    };
});