Nginx redirect folder to subdomain

I'm trying to configure a redirect on Nginx from a folder to a subdomain.
I've tried already Nginx redirect: folder to external domain and Nginx rewrite rule (subdirectory to subdomain) and nginx: redirect subfolder to subdomain. Nothing works.

The problem, are simple. I have a Apache configured with this line:

RedirectPermanent /asd http://asd.domain.com/

Now, I'm trying to replicate this on a Nginx.
Every configuration I've tried, have the same problem:

If I go to http://www.domain.com/asd/, they redirect me to http://asd.domain.com/asd/.

If I go to http://www.domain.com/asd/index, they redirect to http://asd.domain.com/index.

I need to delete the sub-folder in all cases, for me, the first one are incorrect. How can I configure nginx for in first case, go to http://asd.domain.com/?

The rules are applied after root parameter. The config are:

server {
  listen --
  server_name --
  root --
  <> INSERT RULE HERE

  access_log --
  error_log --
  include - (A file with php configurations).
}

Some examples of tried rules:

rewrite ^/asd/(.*) http://asd.domain.com/$1 permanent;

rewrite ^/asd(.*) http://asd.domain.com/$1 permanent;

rewrite ^/asd(.*) http://asd.domain.com$1 permanent;

location ^~ /asd/ { rewrite ^/asd/(.*) http://asd.domain.com/$1 permanent; }

location ^~ /asd/ { rewrite ^/asd(.*) http://asd.domain.com/$1 permanent; }

location ^~ /asd/ { rewrite ^/asd(.*) http://asd.domain.com$1 permanent; }

Also, location variation with "location ~ ^/asd/(.)" or "location ~ ^/asd(.)"

Thanks,

Answer

I think you were close with rewrite ^/asd/(.*) http://asd.domain.com/$1 permanent;

Per the documentation:

If a replacement string includes the new request arguments, the
previous request arguments are appended after them. If this is
undesired, putting a question mark at the end of a replacement string
avoids having them appended

But you might need to add a ?, and just for good practice that ending $ as such:

rewrite ^/asd/(.*)$ http://asd.domain.com/$1? permanent;