Basically, I have a php application running on apache and want that any URL like x.abc.com [x can be anything] works. I can trap the URL and take action based on value of x.

I came to know that entry in hosts file like *.abc.com does not work.
Is there a way we can do it in apache?

Tried this and other variations.

<VirtualHost 127.0.0.1>
DocumentRoot "c:/wamp/www/yojoe-web/html"
ServerAlias *.abc.com
RewriteEngine on
RewriteCond %{HTTP_HOST} !^http://www.* [NC]
</VirtualHost>

Can someone please give me complete config?

Thanks,
Sachin