How to use regular expressions to automatically match wildcard domain names in nginx

Nginx uses regular expressions to automatically match wildcard domain names to directories

Nginx can be used to realize the function of virtual host and bind multiple URLs.
Usually the primary domain name is hard-coded in the configuration, so if you want to add a match, you need to add it manually.

Basic writing

The most basic way to write it is server{
listen 80;
server_name www.a.com;
root /html/a;
…
}

server{
listen 80;
server_name www.b.com;
root /html/b;
…
}

Regular expression

After the domain name is bound, it is automatically matched to the corresponding directory, and there is no need to write configurations for each domain name one by one.
The matching directory is: html/domain name/secondary domain name, for example, www.baidu.com will match the baidu.com/www directory

server {
 listen 80;
 # $subdomain will match the second-level domain name and above # $domain will match the first-level domain name # $tld will match the root node name server_name ~^((?<subdomain>.*)\.)?(?<domain>[^.]+)\.(?<tld>[a-zA-Z]+)$;

 #If there is no $subdomain, jump to www
 if ($subdomain = "") {
  # set $subdomain "_";
  set $subdomain "www";
  return 301 $scheme://www.$domain.$tld$request_uri;
 }

 root /usr/share/nginx/html/${domain}.${tld}/${subdomain};
}

other

There are many articles about nginx's matching order, so I won't go into details.
Because regular expressions have the lowest matching priority, they are only matched when no other matches are found, so there is no need to worry about affecting other exact matches.

Most people don’t have so many domain names to match. Instead, they want to block some malicious domain name pointers.

However, when testing, in order not to affect the running web page, you can add an IP domain name record in the hosts and use a non-existent domain name for testing, which is more useful at this time.

Summarize

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