Trimming the path and redirect in Nginx

I have a Wordpress server at www.mydomain.com/A/B The Nginx config is as:

server {
    listen 80 default;

    root /var/www/html;

  location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }


    location /A/B {
        try_files $uri $uri/ /A/B/index.php?$args;
    }
...
}

This is working fine.

What I want to do now is to redirect a legacy path to the new path.

Basically I want www.mydomain.com/A/B/C/XXX/YYY/ZZZ --> www.mydomain.com/A/B/XXX/YYY/ZZZ. Removing /C.

I believe I could do it with:

location /A/B/C {
            try_files $uri $uri/ /A/B/index.php?$args;
}

But it didn't work. Then I tried

location /A/B/C {
    proxy_pass http://localhost/A/B;  # note the trailing slash here, it matters!
}

I think I maybe need another way since I need the /XXX/YYY path after the /C.

Any help appreciated. Thank you.

You will need to rewrite the URL to remove the C path element.

For example:

rewrite ^(/A/B/)C/(.*)$ $1$2 permanent;

You can place this in the server block, or in a location ^~ /A/B/C/ block.