How to correctly create an htaccess redirect for different subdomains and domains?

Question

htaccess

Good afternoon,
The server hosts domains that are processed by one htaccess (refer to one folder with the site).
Previously, these domains were assigned subdomains of the form

mobile.sudmonain1.site 1 .ru
mobile.sudmonain2.site 1 .ru
mobile.sudmonain1.site 2 .ru

Now we decided to get rid of mobile and leave only the letter m .
What rule can implement this, given that the domains are different, but are processed by one htaccess?
Something like?

RewriteCond %{HTTP_HOST} ^(www\.)?mobile\.(.+) [NC]
RewriteRule ^(.*)$ http://m.%1/$1 [R=301,L]

The result should be a redirect to

m.sudmonain1.site 1 .ru
m.sudmonain2.site 1 .ru
m.sudmonain1.site 2 .ru

Answer 1

RewriteCond %{HTTP_HOST} ^(www\.|)mobile\(.+) [NC]
# domain with or without www select two groups before mobile and after
RewriteRule ^(.*)$ http://%1m%2/ $1 [R=301,L]