Nginx Location Regex Capture Moving

Question

I have a REST API URL:

http://localhost:4000/api/v2/stocks/accounts/1162/tradings

I want it to be proxy_pass for the URL:

http://localhost:4001/api/v2/stocks/accounts/1162/tradings

Where 1162 is a URL parameter, which may be a different value.

I have the following:

location ^~ /api/v2/stocks/accounts/([^/]+)/tradings {
      proxy_pass http://localhost:4001/api/v2/stocks/accounts/$1/tradings;
}

But it does not work (404 Not Found), I have a similar problem in googled, but it doesn't help much:

Like this one: Get nginx arguments and path for proxy_pass or this: problem with location regex and redirect in nginx .

Is there a way to achieve what I want using nginx?

Thanks in advance for your help.

ADDED:

I also added parameter capture:

location ~ /api/v2/stocks/accounts/([^/]+)/tradings/(.*) {
    proxy_pass http://localhost:4001/api/v2/stocks/accounts/$1/tradings/$2$is_args$args;
}

Answer 1

. ' ^ ~'

location ~ /api/v2/stocks/accounts/([^/]+)/tradings {
  proxy_pass http://localhost:4001/api/v2/stocks/accounts/$1/tradings;
}

nginx.org.
^ ~ , :

location ^~ /dir/ {
    # some actions
}