Strict Username mod(want to disable space in username when new users register)

[looking123]

So the strict username mod on mybb ( http://mods.mybb.com/view/strict-username ) don't work. Do someone else know a updated mod like this? I've found some but there were outdated.

Just want the user to only register with a-z 0-9 and perhaps some characters. Now it's possible for users to make accounts with spaces. And I don't want that.

Thank you