How to redirect via .htaccess subdomain from www to subdomain without www?

Question

htaccess

How to redirect via .htaccess subdomain from www to subdomain without www, which in turn is redirected to another page.
Example:
the site is located on the server in the folder domen.ru
There is a redirection of poddomen.domen.ru to domen.ru/poddomen.html (works with .htaccess)

Question: how to make the www.poddomen.domen.ru link work? (it does not open now, it is necessary that in the end from this address there should be a redirect to domen.ru/poddomen.html Thank you!

Answer 1

RewriteCond %{HTTP_HOST} ^(.+)\.example\.ru$
RewriteCond %{HTTP_HOST} ^!www\.example\.ru$
RewriteRule ^$ http://example.ru/%1/.html [L,R=301]