Nginx之限制文件名称为年月日的文件访问

map $request_filename $file_mtime {
    default         0;
    "~(?<file_year>\d{4})"    $file_year;
}


                location ~ .*\.(html|css|jpg|gif|js|png|htm)?$
                        {
                       if ($file_mtime < 2021) {
                                 return 466;
                                }

                        try_files $uri =404;
                        expires 24h;
                        }


                error_page   466  /custom_466.html;