I see. That's pretty much the point where I stopped working on the project because ignoring nicknames was too inefficient. I tried working with regular expressions, but it was no longer worth the effort in my opinion.
Like i said, work for 95% of players. For the players who change nicknames, they tend to either go back to a common nickname or keep it long enough to warrant adding it. So its far from pointless \o/
Pointless in my specific use case - proper filtering of players who frequently change nicknames (and tend to be vanished in some cases).