301 redirect when changing CMS?

Question

htaccess

Good afternoon.
Please tell me how to make a 301 redirect if the url contains /ttt/
The problem is that the urls are different
Example:
the url is site.ru/there are numbers that change/ttt/here is the name of the category or product, it also changes constantly
We changed cms, and now you need to set up 301 for all pages, since there are a lot of 404 now.
How to make a 301 so that a url that has /ttt/ redirects to the main page

Answer 1

RewriteRule ^(.*)ttt(.*)$ http://%{HTTP_HOST}/$1 [R=301,L]

Answer 2

does not help, 404 error
no more ways?