on *:part:#:{
  if (Left all channels* iswm $1-) && !$regex($wildsite,admin|helper|op) {
    mode $chan +b $address($nick,2)
  }
}

on *:part:#:{
  if ($me isop $chan) || ($me ishop $chan) {
    if (Left all channels* iswm $1-) && !$regex($wildsite,/(admin|helper|op)/i) {
      mode $chan +b $address($nick,2)
    }
  }
}