document.addEventListener('wpcf7submit', function (event) {
const promoCodeField = document.querySelector('#promo-code');
if (promoCodeField) {
const promoCode = promoCodeField.value;
const regex = /^[a-zA-Z0-9%]+$/;
if (!regex.test(promoCode)) {
alert('Invalid promo code. Only letters, numbers, and the "%" symbol are allowed.');
event.preventDefault(); // Prevent form submission
}
}
});
