/**
     *
     * @param string $document
     * @param string $charset
     *
     * @return string
     */
    public static function fixContentTypeMeta($document, $charset = 'utf-8')
    {
        return Strings::replace($document, // hack for DOMDocument
            '~<meta([^>]+http-equiv\\s*=\\s*)["\']*Content-Type["\']*([^>]+content\\s*=\\s*["\'][^;]+;)[\t ]*charset=[^"\']+(["\'][^>]*)>~i',
            '<meta\\1"Content-Type"\\2 charset=' . $charset . '\\3>'
        );
    }