validating nested form array[elements], help

[eluser]nohbahdii[/eluser]
Hello,

I have a lengthy form and the elements are named in the following pattern

Code:

<input type="text" name="container[element]" value="" />

How do I write validation rules for these elements?



This is what I have in the controller so far

Code:

$rules = array(
             'applicant[first_name]'    => 'required'
         );
        $fields = array(
             'applicant[first_name]'    => 'First name'
         );
        $this->validation->set_rules($rules);
        $this->validation->set_fields($fields);

.
.
.

        if($this->validation->run())
        {
            // $this->db->insert('container', $this->input->post('container', true));
            $this->db->insert('containers', $this->input->post('container', true));
            $this->load->view('container/success');
        } else {

            redirect('container/add');
        }