How to make a 301 redirect while keeping subdomains?

Question

htaccess

How to make a 301 redirect from podomen.site.ru to podomen.site.com the domain can be anything

Answer 1

RewriteEngine on
RewriteCond %{HTTP_HOST} ^podomen\.site\.ru [NC]
RewriteRule ^(.*)$ http://podomen.site.com/$1 [R=301,L]

...it's not clear what "a subdomain can be anything" means

Answer 2

For nginx:

server {
listen 80;
server_name ~^(?<subdomainname>[a-z0-9\-]+)\.domain\.ru;
return 301 http://$subdomain.domain.com;
}