Code:
on *:nick:{
  if $newnick == [color:blue]test123[/color] {
    var %i = 1
    while $comchan($newnick,%i) {
      if $me isop $v1 { ban -k $v2 $newnick 2 You are in my PERMANENT Ban On Sight List }
      inc %i
    }
  }
}