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

// In your controller
public function my_form_submit()
{ // Load the form validation library $this->load->library('form_validation'); // Set validation rules $this->form_validation->set_rules('username', 'Username', 'required'); $this->form_validation->set_rules('email', 'Email', 'required|valid_email'); $this->form_validation->set_rules('password', 'Password', 'required'); if ($this->form_validation->run() == FALSE) { // Validation failed, show errors $this->load->view('my_form'); } else { // Validation passed, proceed with form submission // Process the form data here // ... }
}