Redirect if specific slug found in URL PHP / Redirect if specific slug not found in URL PHP

regex-for-wp-redirect.php

<?php

/*
* Redirect if specific slug "hello-world OR hello-regex" not found in URL
*/
add_action('template_redirect', 'ic_icredirection');
function ic_icredirection()
{
    if (!is_user_logged_in()) {
        $regex = '/^(?:(?!\/(?:hello-world|hello-regex)(?:\/|$)).)*$/m';
        $str = home_url($_SERVER['REQUEST_URI']);
        if (preg_match_all($regex, $str, $matches, PREG_SET_ORDER, 0)) {
            wp_redirect(home_url());
        }
    }
}

/*
* Redirect if specific slug "hello-world OR hello-regex" found in URL
*/
add_action('template_redirect', 'ic_icredirection');
function ic_icredirection()
{
    if (!is_user_logged_in()) {
        $regex = '/(http(s)?:\/\/)?([\w-]+\.)+[\w-]+(\/[\w- ;,.\/?%&=]*)?(hello-world|hello-regex)/m';
        $str = home_url($_SERVER['REQUEST_URI']);
        if (preg_match_all($regex, $str, $matches, PREG_SET_ORDER, 0)) {
            wp_redirect(home_url());
        }
    }
}