Laravel 5: OR operator in middleware groups

I would like to have some routes which only be available for auth:user OR auth:admin middlewares.

I tried following code :

Route::group(['middleware' => ['auth:user', 'auth:admin']], function () {
   //many routes here
});

But seems like these routes are available for auth:user AND auth:admin at the same time!!!

I don't want AND. I need OR.

Any helps would be appreciated

via Chebli Mohamed