Regex to Valid Phone Number (Malaysia)

     function valid_phone_num($str)
     {
     if (!preg_match("/^(\+?6?01)[0|1|2|3|4|6|7|8|9]\-*[0-9]{7,8}$/", $str)):
       $this->form_validation->set_message('valid_phone_num', 'Please insert a valid phone number format. Example : 0191234567.');
       return FALSE;
     else:
       return TRUE;
    endif;
    }