nginx setup for dynamic domains and their subdomains

nginx_global_domains.config

# Source: https://stackoverflow.com/questions/8199231/how-to-setup-mass-dynamic-virtual-hosts-in-nginx

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    # Match any server name with the format [subdomain.[.subdomain...]].domain.tld.dev
    server_name ~^(?<subdomain>([\w-]+\.)*)?(?<domain>[\w-]+\.[\w-]+)\.dev$;

    # Map by default to (projects_root_path)/(domain.tld)/www;
    set $rootdir "/var/www/$domain/www";

    # Check if a (projects_root_path)/(subdomain.)(domain.tld)/www directory exists
    if (-f "/var/www/$subdomain.$domain/www"){
        # in which case, set that directory as the root
        set $rootdir "/var/www/$subdomain.$domain/www";
    } 

    root $rootdir;

    index index.php index.html index.htm index.nginx-debian.html;

    # Front-controller pattern as recommended by the nginx docs
    location / {
        try_files $uri $uri/ /index.php;
    }

    # Standard php-fpm based on the default config below this point
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}