Биоразлагаемые тарелки

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 } } });