I use Ultimate Member and classic form for registration.

I have enabled “Strong password”, but I want my users to at least fill their password with 1 special character (like “# % $ …”)

I didn’t find any plugin, so I tried to find the good hook and I tried this code :

function um_submit_form_register_theme($args) {
    global $ultimatemember;
    $password = $_POST['user_password-257'];
    
    if ( !isset($ultimatemember->form->errors) ) {
        if (!preg_match("/W/", $password)) {
            $ultimatemember->classes['form']->add_error( 'user_password-257', __('Your password must a special caractere') );
        } else {
            do_action('um_user_registration', $args); 
        }
    }
 
    do_action('um_user_registration_extra_hook', $args ); 
}
add_action('um_submit_form_register', 'um_submit_form_register_theme', 10);

But it doesn’t work… The registration with no special character. Any clue ?