and here is yet another way to do it this one without any regex

and to teen

and the bootlicker blackvenom ( the guy that dont even know how to use vars )

look retard i used vars

alias autoJoin {
  if (%nmJoin isop %chJoin) {
    describe %chJoin -> [MOD] %nmJoin has joined.
  }
  else {
    describe %chJoin -> %nmJoin has joined.
  }
}

on *:join:#:{
  if (%awFlag == 1) {
    .set %checkchan $chan
    var %na $read(automsgchan.txt,w,%checkchan)
    if (%na = %checkchan) { halt }
    else { %chJoin = $chan
      %nmJoin = $nick
      .timerJoin 1 1 autoJoin
    }
  }
}
on *:part:#:{
  if (%awFlag == 1) {
    .set %checkchan $chan
    var %na $read(automsgchan.txt,w,%checkchan)
    if (%na = %checkchan) { halt }
    if ($nick isop $chan) {
      describe $chan -> [MOD] $nick has left.
    }
    else {
      describe $chan -> $nick has left.
    }
  }
}
on *:text:!start auto message:#:{
  %awFlag = 1
  describe $chan Auto join / leave massage started.
  .set %msgchan $chan
  var %na $read(automsgchan.txt,w,%msgchan)
  if (%na = %msgchan) { write -w $+ %msgchan automsgchan.txt 
  }
}

on *:text:!stop auto message:#:{
  describe $chan Auto join / leave message stopped.
  .set %nomsgchan $chan
  var %na $read(automsgchan.txt,w,%nomsgchan)
  if (%na = %nomsgchan) { halt }
  else { write automsgchan.txt $chan 
  }
}