URI Routing with more than one variable?

[eluser]juddmuir[/eluser]
Hi,

Is it possible to set up a routing rule that took e.g.
example.com/products/category_id/product_id
and passed BOTH the category_id and the product_id to whatever function?

In the User Guide, there's an example for only one variable:
$route['product/(:num)'] = "catalog/product_lookup_by_id/$1";

Thanks in advance for any replies.