I'd use iswm so that you're not matching that tag at the end of the nick or in the middle of the nick.

Code:
alias masskick {
  [color:blue]; Check to see if the alias is typed inside a channel, or if a channel name is specified.  If not, give error and exit.[/color]
  if ($chan == $null && $1 == $null) { echo -a ERROR: Use this command in a channel, or specify the channel to use. | return }
  [color:blue]; Set %chan to either the current channel or to $1.[/color]
  if ($1 != $null) {
    var %chan = $1
  }
  else var %chan = $chan
  [color:blue]; Check to see if you have ops.  If not, give an error and halt.[/color]
  if ($me !isop %chan) { echo -a ERROR: You are not opped in the channel. | return }
  var %c = 1
  var %i = $nick(%chan,0)
  while (%c <= %i) {
    var %nick = $nick(%chan,%c)
    [color:blue]; Check to see if the nick is $me, or if the nick has the rotk' tag at the beginning of the nick.  If either is true, skip the nick.  Otherwise, continue with the kick.[/color]
    if (rotk'* !iswm %nick && %nick != $me) { 
      kick %chan %nick Masskick Everyone is kicked so don't take it personal.
    }
    inc %c
  }
}


As you can see, I've added some error checking. I also got rid of those annoying GOTOs and swapped sets for vars. laugh

Use: /masskick [#chan]

You can type /masskick inside a channel and it will work, or you can type /masskick #channelname anywhere and it will work for the channel specified.

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