Possibly use a regular-expression type system for the usernames? In your case they seem to all be named catbot_\w.
This would be a constant game of cat/mouse and is likely not worth the time to maintain it, but it could help.
Possibly use a regular-expression type system for the usernames? In your case they seem to all be named catbot_\w.
This would be a constant game of cat/mouse and is likely not worth the time to maintain it, but it could help.