function onChange(control, oldValue, newValue, isLoading) {

    if (isLoading || newValue == '') {

        return;

    }

​

    var regexp = /^[0-]{4}-[0-9]{6}-[0-9]{2}$/;

​

    if (!regexp.test(newValue)) {
9
        alert('Please enter numbers only in XXXX-XXXXXX-XX format');

        g_form.setValue('REPLACE WITH YOUR FIELD NAME', '');

    }

}

​