public function getZipCodeRE()
    {
        $zipCodeFormat = $this->getZipCodeFormat();

        if (empty($zipCodeFormat)) {
            return null;
        }


        $zipCodeRE = preg_replace("/\\s+/", ' ', $zipCodeFormat);

        $trans = [
            "N" => "\\d",
            "L" => "[a-zA-Z]",
            "C" => ".+",
            " " => " +"
        ];

        $zipCodeRE = "#^" . strtr($zipCodeRE, $trans) . "$#";

        return $zipCodeRE;
    }