My Form validation

[eluser]Unknown[/eluser]
Hello I want to create my form validation.

This is libraries/my_form_validation.php:

Code:

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class My_Form_validation extends CI_Form_validation {

    function __construct() {
        parent::__construct();
        $CI = & get_instance();
    }

    // --------------------------------------------------------------------

    /**
     */
    function validation_text($str) {

        $CI->form_validation->set_message('validation_text', 'Incorrect Cyrillic text.');

        return (preg_match("/^[a-zA-Z\p{Cyrillic}0-9\s\-\.\!\?]+$/u", $str)) ? TRUE : FALSE;
    }

}

And use controler method

Code:

$this->load->library('form_validation');
        $this->load->library('my_form_validation');
$this->form_validation->set_rules('newstitle', 'News title', 'trim|required|min_length[10]|validation_text[newstitle]');
if ($this->form_validation->run()) { .........

My form valdiation is not work.

I test preg_match in test.php(outside ci) and add some text and work, no problem
but in codeigniter not receive

Where am I wrong?

Thank you