htaccess: Redirect with virtual subdomains

Please help me! I have moved my entire site from ASP to PHP and need a 301 Redirect that will send the old asp-pages to the new php-pages (with the same name - except from the php-extension): -->

And default.asp should go to index.php: -->

So fare this works fine:

RedirectMatch permanent (.*)default\.asp$$1index.php
RedirectMatch permanent (.*)\.asp$$1.php

BUT, it also needs to work with virtual subdomains: -->

This is as fare as I got:

RewriteCond %{HTTP_HOST} ^([^\.]+)\.mydomain\.com$ [NC]
RedirectMatch permanent (.*)default\.asp$$1index.php
RedirectMatch permanent (.*)\.asp$$1.php

But is is not working...
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Dushyant SharmaCommented:
try this

RedirectMatch ^/(.*)\.asp$ /dept/$1.php
Dushyant SharmaCommented:
oops!! dept is part of my redirect please remove that

RedirectMatch ^/(.*)\.asp$ /$1.php

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Andreasa2010Author Commented:

I actually - with a litle help - got this to work:

RewriteEngine On
RewriteRule (.*)default\.asp$ http://%{HTTP_HOST}/$1index.php [L,R=301]
RewriteRule (.*)\.asp$ http://%{HTTP_HOST}/$1.php [L,R=301]

But you get the points!
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