CodeIgniter Form_Validation for uri segments

Question

I want to use the form_validation on values other than $_POST parameters. So for example i have this function in a controller

public function items($category=NULL, $id=NULL){
    //how do i run $category and $id through form_validation        
}

Answer 1

Here is a function someone posted on the CodeIgniter forums that uses the same validation rules as form_validation

http://ellislab.com/forums/viewthread/153602/