Regex on Variable ($servername)

[basti]

Hello,

i try to setup a catch all proxy server with nginx.
I want to catch domains like this but have only domainname (without
subdomain) in $domain

In this example from nginx docs domain has "fullname".

server {
    server_name ~^(www\.)?(*?<domain>*.+)$;
    root /sites/*$domain*;
}

servername: www.example.com -> $domain should be example.com

Best Regards
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