StackFormation\ValueResolver\Stage\Clean::invoke PHP Method

    public function invoke($string)
    {
        $string = preg_replace_callback('/\\{clean:([^:\\}\\{]+?)\\}/', function ($matches) {
            return preg_replace('/[^-a-zA-Z0-9]/', '', $matches[1]);
        }, $string);
        return $string;
    }