use the regex match of subdomain

[FrancYescO]

i'm trying witouth success to proxy a range of subdomain to another host/path.. something like this

reproxy --static.enabled --static.rule="(.*).example.com,(.*),https://$1.foo.com/$2"

that should result in
http://AAAA.example.com/UUUU proxied to https://AAAA.foo.com/UUUU

Is this possible somehow?

[umputun]

moved to discussion