Create preg_match for password validation allowing (!@#$%)

Question

I would like to create a preg_match function to validate my passowrds, but I\'m not sure how to write it to allow the following special characters to be used: <

Answer 1

if (!preg_match('/^(?=.*\d)(?=.*[A-Za-z])(?=.*[!@#$%])[0-9A-Za-z!@#$%]
{6,15}$/',($_POST['password']))) {
    $message='Password must contain 6 characters of letters, numbers and 
    at least one special character.';
}