502 Bad Gateway caused by parse "invalid character in host name" (solved)

Traefik Traefik v2 (latest)
,
1

So I'm trying to redirect requests without domain name (aka LAN search-domains)
to the correct FQDN (so I could use certificates).
For some reason it says that there's invalid character when trying to access : "http://who"
I'm expecting to to be redirected to https+fqdn

time="2022-06-14T20:51:27+03:00" level=debug msg="'502 Bad Gateway' caused by: parse \"https://${1}.docker.internal/${2}\": invalid character \"{\" in host name"
time="2022-06-14T20:51:28+03:00" level=debug msg="'502 Bad Gateway' caused by: parse \"https://${1}.docker.internal/${2}\": invalid character \"{\" in host name"

dynamic.yaml:

http:
        middlewares:
                expand-fqdn:
                        redirectRegex:
                                regex: "^https?://([^.]+)/(.*)"
                                replacement: "https://$${1}.docker.internal/$${2}"
                                permanent: "true"
2

my mistake, i supposed to used 1 dollar sign when using FILE (compered to docker)

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