function mayak_nav_menu_no_link($no_link){
$gg_mk = '!<li(.*?)class="(.*?)current_page_item(.*?)"><a(.*?)>(.*?)</a>!si';
$dd_mk = '<li$1class="\\2current_page_item\\3">$5';
return preg_replace($gg_mk, $dd_mk, $no_link );
}
add_filter('wp_nav_menu', 'mayak_nav_menu_no_link');