Nginx config for redirect map

 Using 'Map' for redirects

map_hash_bucket_size 128;
map $uri $new_uri {
    /test-to-rewrite /test-rewritten;
    /test2-to-rewrite /test2-rewritten;
}

server {
    server_name example.com;
    if ($new_uri) {
        return 301 $new_uri;
    }
#...
}        

Source: https://www.dogsbody.com/blog/nginx-optimising-redirects/

Another example for using query strings:

http {

    map_hash_bucket_size 128;

    map $uri$is_args$args $new_uri {

        #/hello?123     /hello123?345;

        include /my-location/redirect.tsv;

        default        $uri$is_args$args;  # Default to the original URI if not matched

    }

  

server {

  location / {

     if ($new_uri != $uri$is_args$args) {

        return 302 $new_uri;

     } 

  }

}

File: redirect.tsv

/hello?123     /hello123?345;