The "pattern" is null which means you didn't re-create the configuration file, or something is messed up with the regex matcher line.
@Pompeyo "Wut" (what?) is just a word normally people use to describe an expression of confusion.please forgive my insistence, but I can not understand wut, I speak spanish and I depend on the google translator, I could repeat your answer in a more specific way, thanks !!!
Constantly changing their name? How? You mean reconnecting?@Revezunds thank you for your help, I already imagined it was something like that.
really what I need is to prevent players from constantly changing the name, that's a bit annoying, and here they abuse that, in the previous version of this plugin that function was working, but with this it does not work anymore, I wanted to know if it disabling or if it's my problem
Normally changing the name in server is personal choice unless someone is impersonating someone while the original name holder is online.