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

// Example usage:
console.log(isValidEmail("test@example.com")); // true
console.log(isValidEmail("invalid-email")); // false