Redirection from domain to domain, plus a bunch of subdomains, how to implement on .htaccess?

Question

htaccess

Hello.
There is a project to a bunch of subdomains. I'm moving to another domain with all these subdomains.
domain1.com/primer to domain.com2/primer
ga.domain1.com/hdaj to ga.domain2.com/hdaj
jask.domain1.com/sajk/isuai to jask.domain2.com/sajk/isuai
and so on, subdomains several hundred, tens of thousands of pages
How to register all this in htaccess?

Answer 1

Your question is written incorrectly, so there will be an incorrect answer.
at least there is no domain.com2 domain, and therefore you have already shown something wrong, so I will assume.
But based on my thoughts, I can assume that you needed this

RewriteCond %{HTTP_HOST} ^(.+)\.domain1\.com$ [NC] 
RewriteRule ^(.*)$ https://%1.domain2\.com/$1 [R=301,L]

will work for all 3rd level domains
(.+)- one or more characters
\.- just dot escaped.
%1- analogue of $1 but from RewriteCond