jquery post & ci form validation

[eluser]yesov[/eluser]
to Nick: i know about create a custom validation rules, but i want to use "standart",
for example: "trim|required|min_length[5]|max_length[12]|xss_clean"

Code:

...
$data = json_decode($this->input->post('a'));
...

and after this $data is

Code:

Array
(
    [0] => stdClass Object
        (
            [link] => http://example.com
            [title] => test web page
        )

)

and i interesting, can i use "standart" ci validation for my object properties (link, title ....) ?
and can i use this code for validate ? (and what in $fields array?)

Code:

$rules = array(
    "title" => "min_length[10]"
);
$fields = array(
    "" => ""
);
$this->validation->set_rules($rules);
$this->validation->set_fields($fields);

if ($this->validation->run()) {
    $result =  .... ?
}

sorry for my english