Routing - combing URL segments to form a method name?

[eluser]Prophet[/eluser]
Hello all

Is something like the following possible with CI's routing library?

Code:

$route['admin/product_required_details/(:any)/(:num)/(:any)'] = 'admin/product_required_details/$3_$1/$2';

For example, I would like:

admin/product_required_details/option/5/edit

...to route to:

admin/product_required_details/edit_option/5

(i.e. it should call the edit_option() method and pass 5 as the parameter.

Thanks in advance for any advice.