We're using the username filter to prevent certain usernames being used on the site & the wildcarding is working well. We have, however, noticed that you can create usernames with * (asterisks) in them and can't find a way/pattern to prevent this.
This is an example of what it will let through as a valid username 
We tried a bunch of filters to try to stop this, but didn't find anything that worked.
Any ideas?
