Rewrite to nginx?

Question

Nginx

How to make a redirect from www to a domain without www is understandable. I wanted to ask for help setting up a redirect from www-subdomains. That is, subdomains are available via www.subdomain.servername.ru , but I would like to redirect them to subdomain.servername.ru
server {
server_name www.servername.ru;
rewrite ^(.+)$ servername.ru$1 permanent;
}

Answer 1

server {
    server_name ~^www\.(.+)\.example\.com$;
    return 301 $1.example.com/$request_uri;
}

Answer 2

server {
server_name ~^www\.(.*?)\.example\.com$;
rewrite ^www\.(.*?)\.example\.com$ $1\.example.com permanent;
}
somewhere like this