[skip a DB hit, and better regex
Evan Prodromou <evan@prodromou.name>**20080620203449] {
hunk ./lib/util.php 448
-	$r = preg_replace('/(^|\s+)@([\w-]+)/e', "'\\1@'.common_at_link($id, '\\2')", $r);
+	$r = preg_replace('/(^|\s+)@([a-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $r);
hunk ./lib/util.php 476
-			$recipient = $recipient->getProfile();
-			return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
+			return '<a href="'.htmlspecialchars(common_profile_url($nickname)).'" class="atlink usertouser">'.$nickname.'</a>';
}