routes

[eluser]Fr3aked0ut[/eluser]
Hi.
How can I make route that I don't HAVE to use it?

I mean, let's say I have this url:
http://test.com/some.html,0

",0" is the page (pagination class).

I want to able the user to go in with out the ",0" (on the first page only). How do I do that?

This is my route:
$route['cat/(:num)-(:any).html,(:num)'] = 'pages/cat/$1/$2/$3';

I want to make the ",(:num)" optional.

Thanks in advance.