Nginx Redirect hostname+location - redirect

Question

my nginx config uses server_name _; to process all domains in a single server{} block and direct them all to the same codebase sitting in a single folder with a single index.php that sorts out the domain routing. (that's the way the web framework works with 100's of domains within a single cluster - cant change this).
One of the sites has 2 domains. One for each language, let's call them example.com and example.net. This site also has language-specific subfolders, let's call them: /com/ and /net/.
I need to create a redirect that ensures the language subfolder is only loaded on the matching domain.
eg, valid requests:
example.com/com/
example.net/net/
Any other request needs to be redirected based on the subfolder:
example.com/net/ -> example.net/net/
example.net/com/ -> example.com/com/
I cant do it with the framework because the folder contains all static files, so the router is never loaded. Can this be done in the nginx config?
Thank you
update, adding simplified version of my config:
server {
listen 80 default_server;
server_name _;
root /my/app/root;
index index.php index.html;
location / {
try_files $uri /index.php;
}
#PHP
location ~ \.php$ {
try_files $uri = 404;
[fastcgi stuff]
}
location = /favicon.ico {
access_log off;
log_not_found off;
}
location = /apple-touch-icon.png {
access_log off; log_not_found off;
}
location = /apple-touch-icon-precomposed.png {
access_log off;
log_not_found off;
}
}

Answer 1

I think that you will need 1 location block per subfolder (but have not tested it):
location /com {
proxy_pass http://upstream:8888/com;
proxy_set_header Host example.com;
proxy_pass_request_headers on;
}
location /net {
proxy_pass http://upstream:8888/net;
proxy_set_header Host example.net;
proxy_pass_request_headers on;
}

Answer 2

Solved it...
location /com/ {
if ($host = 'www.example.net') {
return 301 https://www.example.com$request_uri;
}
index index.html;
}
And the reverse for the other location/domain