How to get a GET parameter from a subdomain?

Question

htaccess

Hello!
I decided to make a subdomain on my site for each city. Previously, he received a city and an article. - site.ru/city/article. I received parameters in htaccess, before -
RewriteRule ^(.*)/(.*).html$ index.php?city=$1&articles=$2 [L]
everything worked.
Now the structure is like this - city.site.ru/article.
Now I'm doing like this -
RewriteRule ^(.*).site.ru/(.*).html$ index.php?city=$1&articles=$2 [L] - doesn't work, but it should

Answer 1

RewriteCond %{HTTP_HOST} ^(?>www\.|)([^.]+)\.site\.ru$ [NC]
RewriteRule ^(.*)\.html$ index.php?city=%1&articles=$1 [L]