Suppose Cyrillic characters range from ASCII 192 (hex C0) to ASCII 253 (hex FD), this script will identify nicks that contain Cyrillic characters:

alias isCyrillic return $regex($1, [\x[color:blue]C0-\xFD])

On @*:join:#:{
  • if $isCyrillic($nick) {
    kick # $nick Please get a pure english nick
    }
}[/color]