trim|valid_email not working in validation

Firstly load form_validation library after that use set_rules
Check this code for valid email


$this->load->library('form_validation');
$this->form_validation->set_rules('email', 'Email address', 'trim|required|valid_email');

The problem was when I also use set_data(). Then trim do not work on the data as I expected. Case closed. Thanks.