How to make a 301 redirect from a subdomain to a subdomain?

Question

htaccess

I have many sites like

city.domain.ru
city1.domain.ru

We have changed the main domain, how can I make all subdomains redirect to the new subdomains?

city.domainnew.ru
city1.domainnew.ru

To have a universal solution and not write a redirect for each city

Answer 1

RewriteCond %{HTTP_HOST} ^(.+)\.domain\.ru
RewriteRule .* https://%1.domainnew.ru/$0 [R=301,L]