Htaccess for external domain - php

Question

RewriteEngine On
RewriteCond %{REQUEST_URI} !(\.css|\.js|\.png|\.jpg|\.gif|robots\.txt)$ [NC]
RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTP_HOST} ^(.*).domain\.com
RewriteRule ^(.*)$ load.php?id=%1&q=$1 [NC,QSA,L]
This is my current code
subdomain.domain.com/querystring
The condition is domain.com
Is there a way I can achieve the same thing
but the domain.com can be dynamic, means it could be 123456.co or qwerty1234.xyz/querystring
Yet it able capture
Domain: qwerty1234.xyz
Query String: querystring
How do I make my htaccess to check if domain is not containing domain.com, it will use load.php
but pass the domain & its query string to load.php as ?domain=$domain&query=$querystring
Thanks!
Updated .htaccess
RewriteEngine On
RewriteCond %{REQUEST_URI} !(\.css|\.js|\.png|\.jpg|\.gif|robots\.txt)$ [NC]
RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTP_HOST} ^(.*).domain\.com
RewriteRule ^(.*)$ load.php?id=%1&q=$1 [NC,QSA,L]
RewriteCond %{REQUEST_URI} !(\.)?(css|js|png|jpg|gif|robots\.txt)$ [NC]
RewriteCond %{HTTP_HOST} ^(.*)$
RewriteRule ^(.*)$ load.php?id=%1&q=$1 [NC,QSA,L]

Answer 1

You should be able to add this to your rules. You don't have to do anything special to capture the querystring. Simply keep the QSA flag and any additional query string on the request will also be sent to load.php.
RewriteEngine on
RewriteCond %{REQUEST_URI} !(\.)?(css|js|png|jpg|gif|robots\.txt)$ [NC]
RewriteCond %{HTTP_HOST} !^(www\.)?domain\.com
RewriteCond %{HTTP_HOST} ^(.*)$
RewriteRule ^(.*)$ load.php?domain=%1 [NC,QSA,L]