static function get_redirect_url($requested_redirect_to)
 {
     global $wpdb, $rul_db_addresses;
     $redirect_to = false;
     $rul_all = $wpdb->get_var('SELECT rul_url FROM ' . $rul_db_addresses . ' WHERE rul_type = \'register\' LIMIT 1');
     if ($rul_all) {
         $redirect_to = rulRedirectFunctionCollection::rul_replace_variable($rul_all, false);
         return $redirect_to;
     }
     // No rule exists
     return $redirect_to;
 }
 function rul_replace_variable($string, $user)
 {
     preg_match_all("/\\[variable\\](.*?)\\[\\/variable\\]/is", $string, $out);
     foreach ($out[0] as $instance => $full_match) {
         $replaced_variable = rulRedirectFunctionCollection::rul_get_variable($out[1][$instance], $user);
         $string = str_replace($full_match, $replaced_variable, $string);
     }
     return $string;
 }