private function _cmpFrm($txt)
    {
        $CmpFrmRV = '';
        $length = mb_strlen($txt, 'UTF-8');
        for ($CmpFrmI = 0; $CmpFrmI < $length; $CmpFrmI++) {
            if (mb_substr($txt, $CmpFrmI, 1, 'UTF-8') === '0') {
                $CmpFrmRV .= $this->aCmpReg[0];
            } elseif (mb_substr($txt, $CmpFrmI, 1, 'UTF-8') === '1') {
                $CmpFrmRV .= $this->aCmpReg[1];
            } elseif (mb_substr($txt, $CmpFrmI, 1, 'UTF-8') === '2') {
                $CmpFrmRV .= $this->aCmpReg[2];
            } else {
                $CmpFrmRV .= mb_substr($txt, $CmpFrmI, 1, 'UTF-8');
            }
        }

        return $CmpFrmRV;
    }