if (!$grant) {

    // We check the paths registered by the special pages setting.

    $pages = $config->get('domain_grant_all');

​

    // Check if $pages is not null and not empty before using preg_quote

    if ($pages !== null && $pages !== '') {

        $options['pages'] = $pages;

        $regexp = '/^(' . preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1' . preg_quote(config_get('system.performance', 'site_frontpage'), '/') . '\2'), preg_quote($pages, '/')) . ')$/';

​

        // Compare with the internal and path alias (if any).

        $page_match = preg_match($regexp, $_GET['q']);

        if (!$page_match && function_exists('backdrop_get_path_alias')) {

            $path = backdrop_get_path_alias($_GET['q']);

            if ($path != $_GET['q']) {

                $page_match = preg_match($regexp, $path);

            }

        }

        if ($page_match) {

            $options['page_match'] = TRUE;

            $grant = TRUE;

        }

    } else {

        // Handle the case where $pages is null or empty

        // You can add appropriate fallback logic or error handling here

    }

}