Whitelisting links to forum

[Jon12345]

In my Spam Management section I have the following:

/^http(|s):\/\/\S+/si
www
//

It is to stop new members from spamming. However, users are complaining that if they reply to a post, that post may contain a url and then the spam filter gets triggered, thus confusing the new user. They are asking that if the url contains a link to a url that points to the forum, then it is clearly not spam and so can those links be whitelisted.

Is this possible?
Whitelisting links to forum

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