How to make user reply a post before he can see the link?
 

ok so here is what i've done to make users register before they can see links.
Code:
if ((!$this->registry->userinfo[userid]) OR (is_member_of($this->registry->userinfo, 1, 3)))
{
$this->post['message'] = preg_replace("!]*(http|www)(.*)!siU", $vbphrase[nolink], $this->post['message']);
}
Now how can i make them reply a post before they can see links?
what's mean they must replay before the can see the link?