Latte\Runtime\Filters::escapeICal PHP Метод

    public static function escapeICal($s)
    {
        // https://www.ietf.org/rfc/rfc5545.txt
        return addcslashes(preg_replace('#[\\x00-\\x08\\x0B\\x0C-\\x1F]+#', '', $s), "\";\\,:\n");
    }