email validation form

home.php

public function request_a_demo() {
    $data = array();
    $data['for_universities_section'] = TRUE;

    $this->form_validation->set_rules('name', 'Name', 'trim|required');
    $this->form_validation->set_rules('institution', 'University/College', 'trim|required');
    $this->form_validation->set_rules('position', 'Position', 'trim|required');
    $this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email');

    if ($this->form_validation->run() == FALSE)
    {
      $this->template->set_layout('public')->build('home/request_a_demo', $data);
    }
    else
    {
      die(var_dump($_POST));
      $this->template->set_layout('public')->build('home/request_a_demo_sent', $data);
    }
  }