Руслан Касымов

location ~ /upload/catalog/posob/_/s/_s-(?<code>\d+)_cover_image_small.jpeg$ {
     rewrite ^ /upload/catalog/posob/_/s/_s-$code/cover_image_small.jpeg last;
 }


</code>


PS /code не нужен это что то тостер глючит с тегами

server {
    server_name site.com www.site.com;
    root /path/to_you/site_dir;
    location ~ /user/$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    location ~ \.php$ {
        ...
        fastcgi_param USER_SUBDOMAIN "_MAIN_";
        ...
    }
}
server {
    server_name "~^(?<user_subdomain>[a-z0-9_-]{2,20})\.site\.com$";
    root /path/to_you/site_dir;
    location ~ /assets/$ {
        alias /path/to_you/site_dir/user/$user_subdomain/
    }
    location ~ \.php$ {
        ...
        fastcgi_param USER_SUBDOMAIN $user_subdomain;
        ...
    }
}