Simplify NGINX server_name regex

doc/pages/administration.md

@@ -414,20 +414,20 @@ not remove the backslashes.
 If your GitLab pages domain is `example.io`, replace:
 
 ```bash
-server_name ~^(?<group>.*)\.YOUR_GITLAB_PAGES\.DOMAIN$;
+server_name ~^.*\.YOUR_GITLAB_PAGES\.DOMAIN$;
 ```
 
 with:
 
 ```
-server_name ~^(?<group>.*)\.example\.io$;
+server_name ~^.*\.example\.io$;
 ```
 
-If you are using a subdomain, make sure to escape all dots (`.`) with a
-backslash (\). For example `pages.example.io` would be:
+If you are using a subdomain, make sure to escape all dots (`.`) except from
+the first one with a backslash (\). For example `pages.example.io` would be:
 
 ```
-server_name ~^(?<group>.*)\.pages\.example\.io$;
+server_name ~^.*\.pages\.example\.io$;
 ```
 
 ## Set maximum pages size

lib/support/nginx/gitlab-pages

@@ -7,7 +7,7 @@ server {
   listen [::]:80 ipv6only=on;
 
   ## Replace this with something like pages.gitlab.com
-  server_name ~^(?<group>.*)\.YOUR_GITLAB_PAGES\.DOMAIN$;
+  server_name ~^.*\.YOUR_GITLAB_PAGES\.DOMAIN$;
 
   ## Individual nginx logs for GitLab pages
   access_log  /var/log/nginx/gitlab_pages_access.log;

lib/support/nginx/gitlab-pages-ssl

@@ -11,7 +11,7 @@ server {
   listen [::]:80 ipv6only=on;
 
   ## Replace this with something like pages.gitlab.com
-  server_name ~^(?<group>.*)\.YOUR_GITLAB_PAGES\.DOMAIN$;
+  server_name ~^.*\.YOUR_GITLAB_PAGES\.DOMAIN$;
   server_tokens off; ## Don't show the nginx version number, a security best practice
 
   return 301  https://$http_host$request_uri;
@@ -26,7 +26,7 @@ server {
   listen [::]:443 ipv6only=on ssl http2;
 
   ## Replace this with something like pages.gitlab.com
-  server_name ~^(?<group>.*)\.YOUR_GITLAB_PAGES\.DOMAIN$;
+  server_name ~^.*\.YOUR_GITLAB_PAGES\.DOMAIN$;
   server_tokens off; ## Don't show the nginx version number, a security best practice
 
   ## Strong SSL Security