[PHP] preg_replace question

[Jean-Christian IMbeault]

I found this nice preg_replace function that replaces all occurrences of 
an HTML anchor (<a href=...) with a link to another PHP script that log 
the link and then sends the user on his merry way to the the appropriate 
page/site:

preg_replace(
  "#<a href=(\"|')http://([^\"']+)(\"|')#ime",
  '"<a href=\"/exit.php?url=".base64_encode(\'\\2\')."\""',
  $originalLink
);
I'd like to modify this expression so that it does the same thing but 
*only* if the link is not to a specific page. I.e. I would like to 
replace all links *unless* the link was to, for example, www.mydomain.com.

How can I achieve this with a regexp? I'm not very good at 'negative' 
regexp ...

Thanks,

Jean-Christian Imbeault

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