protected function getNormalizedPosition($pos)
    {
        if ($pos >= strlen($this->account) || $pos < -strlen($this->account)) {
            throw new ValidatorOutOfBoundsException("Cannot access offset $pos in String $this->account");

        }

        if ($pos >= 0) {
            return $pos;

        }
        return strlen($this->account) + $pos;
    }