RewriteEngine: subdomain to index.php, how?

Days later I asked about redirecting dynamic directories to index.php, and I got this code that works perfect (it's the only code I have in .htaccess):

RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule (.*) index.php

This translates urls like http://mydomain.example/dynamicdir/ to http://mydomain.exampl开发者_StackOverflow社区e/index.php

Now I want to translate subdomains like http://dynamicdir.mydomain.example to http://mydomain.example/index.php?dir=dynamicdir

From examples I found in Internet I tried adding this line:

RewriteRule ^(.*)\.mydomain\.example index.php?dir=$1

But it doesn't work. I don't have enough experience with mod-rewrite to tell what's missing or wrong. Could you please help me to find a way to keep the dynamic directory translation, and add the catch-all subdomain rule?

Regards!

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The mod_rewrite rules use the request path, which is relative to the virtual host. Try having different rewrite rules for each virtual host, but placing their documents in the same directory.

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With RewriteRule you can only test the URL path. For the host name, you need to use %{HTTP_HOST} in a RewriteCond:

RewriteCond %{HTTP_HOST} ^(.+)\.example\.example$
RewriteRule ^ index.php?dir=%1