Codeigniter 3 Url without controller

I just did my routes like this:

Code:

//Default pages routes
$route['(:any)'] = 'Controller_name/$1';
$route['default_controller'] = 'Controller_name';

And htacces like:

Code:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [PT,L]

And it worked for me. But when i try the same in CI3 it won't work

So maybe I better can use CI2 for my project?
Or is there a other way?