Laravel middleware multi roles routing

I have problem to make routing with middleware multi roles I have tried some in internet but still wont work

I have 3 roles, superadmin, admin and member I want the superadmin and admin can access the add page

here is my code :

Route::group(['prefix' => 'staff', 'middleware' => 'auth'], function () {

Route::GET('/add', [
    'uses'       => 'StaffController@page_add',
    'middleware' => 'rule:superadmin', ???
]);

});

I have tried to put 'middleware' => 'rule:superadmin|rule:admin' but wont work

thank you

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