How to make htaccess 301 redirect?

Question

htaccess

I want to make a redirect from a link like site.com/ru/ to ru.site.com
I tried this:

RewriteCond %{HTTP_HOST} ^site.com/ru/
RewriteRule ^$ https://ru.site.com/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} /ru/ [NC]
RewriteRule ^$ https://ru.site.com/ [R=301,L]

Answer 1

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