wp_nav_menu change sub-menu class name?

Question

Is there a way to change the child

generated by WordPress itself to a custom class name?

I know the parent

Answer 1

You can use WordPress preg_replace filter (in your theme functions.php file) example:

function new_submenu_class($menu) {    
    $menu = preg_replace('/ class="sub-menu"/','/ class="yourclass" /',$menu);        
    return $menu;      
}

add_filter('wp_nav_menu','new_submenu_class');