function isValidEmail(email) {
  const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
  return emailRegex.test(email);
}

// Examples:
// console.log(isValidEmail("test@example.com")); // true
// console.log(isValidEmail("invalid-email")); // false
// console.log(isValidEmail("user.name+tag@sub.domain.co.uk")); // true