How to set up a 301 redirect of a renamed directory?

Question

htaccess

It is not possible to correctly prescribe the rule for the redirect.
Url can be of the form:
site.ru/aaa/bbb/old
site.ru/aaa/bbb/old/ccc/ddd
Replace old with new.
I tried to modify this rule in different ways, but it
#RewriteRule ^old$ new/ [R=301,L]
did not work out to achieve the desired result.

Answer 1

RewriteRule ^([^/]+/[^/]+/)old(/.*)?$ /$1new$2 [R=301,L]