I use wildcards in my DNS to allow sub domains, so request to:

mysite.com
office.mysite.com

will both point to my server.

I would like to add a wildcard in the virtual host so that if a request to:

error.mysite.com

was entered it would still point to the correct virtual domain, as opposed to the ip of my server.

I have tried adding a host definition to:

*.mysite.com

but it didnt work, unless you entered *.mysite.com as the URL.

Is there a way to use wildcards in the virtual host, or do they have to be absolute?