don't accept just 'http://' etc as a URL

inc/functions.php

@@ -1372,7 +1372,7 @@
 			$markup_urls = Array();
 			
 			$body = preg_replace_callback(
-					'/((?:https?:\/\/|ftp:\/\/|irc:\/\/)[^\s<>()"]*?(?:\([^\s<>()"]*?\)[^\s<>()"]*?)*)((?:\s|<|>|"|\.||\]|!|\?|,|&#44;|&quot;)*(?:[\s<>()"]|$))/',
+					'/((?:https?:\/\/|ftp:\/\/|irc:\/\/)[^\s<>()"]+?(?:\([^\s<>()"]*?\)[^\s<>()"]*?)*)((?:\s|<|>|"|\.||\]|!|\?|,|&#44;|&quot;)*(?:[\s<>()"]|$))/',
 					'markup_url',
 					$body,
 					-1,