RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\ HTTP/ 
RewriteRule ^index\.php$ http://site.ru/ [R=301,L] 

 if ($do == "cat" and $category != '' and $subaction == '') { 

          if( $config['allow_alt_url'] == "yes" AND $category_id AND $view_template != "rss") {
 
            $re_cat = get_url( $category_id );
 
            if ($re_cat != $_GET['category'] OR substr ( $_SERVER['REQUEST_URI'], - 1, 1 ) != '/' ) {
               $re_url = explode ( "index.php", strtolower ( $_SERVER['PHP_SELF'] ) );
               $re_url = reset ( $re_url );
 
               header("HTTP/1.0 301 Moved Permanently");
               header("Location: {$re_url}{$re_cat}/");
               die("Redirect");
            }
         } 

 RewriteRule ^(.+)/$ $1 [R=301,L]