username in register page

when i try to register a username contains of two words between them a space a message came to me and told me that there is some blocked letters or something like this !

please told me how to fix it

as you see in this image in discuz.net

open file:uc_client\model\user.php

find:

1. preg_match("/\s+|^c:\\con\\con|[%,\*"\s\<\>\&]|$guestexp/is"

复制代码

alter:

1. preg_match("/^c:\\con\\con|[%,\*"\<\>\&]|$guestexp/is"

复制代码

允许空格注册好像不太好