Is it possible to set a variable in Nginx without an IF block?

Question

Nginx

I need to get the subdomain for further use in the config. Now I'm doing this:

set $subdomain "";
if ($host ~ "^(.*)\.site\.com\.local$") {
    set $subdomain $1;
}

Answer 1

nginx.org/ru/docs/http/ngx_http_map_module.html

map $host $subdomain {
    default "";
    ~^(.*)\.site\.com\.local$  $1;
}

Or use a regular expression with named selection as the server name.
nginx.org/ru/docs/http/ngx_http_core_module.html#s...
server_name ~^(?<subdomain>.*)\.site\.com\.local$;