Redirecting with a regex

I have a simple use-case: I want to redirect all pages from https://www.t18s.fr/en/path to https://www.t18s.fr/path.

The goal is thus to redirect all pages found by a regexp.

Found here: https://caddy.community/t/regex-on-redir-solved/5215/7, the trick is to use a rewrite rule then a redir rule in order to trigger the rewrite_uri placeholder.

rewrite {
  r ^/en/(.*)
  to /{1}
}

redir {
  if {uri} not {rewrite_uri}
  / https://www.t18s.fr{rewrite_uri} 301
}