$replacetok(%string,sub1, n1, token1, sub2, n2, token2, ...)

alias replacetok {
  var %string $1
  var %count 2

  while %count < $0 {

    var %replaceText [ $ $+ [ %count ] ]
    inc %count

    var %max $pos(%string,%replaceText, 0)

    var %token $parseRange([ $ $+ [ %count ] ], %max)
    inc %count

    var %startTok $token(%token,1,32)
    var %endTok $token(%token,2,32) + 1

    var %text [ $ $+ [ %count ] ]
    inc %count

    var %tokensReplaced 0

    while %startTok < %endTok {
      var %pos $pos(%string,%replaceText,$calc(%startTok - %tokensReplaced))
      var %string $+($left(%string,$calc(%pos - 1)),%text,$right(%string,- $+ $calc(%pos + $len(%replaceText) - 1)))

      inc %startTok
      inc %tokensReplaced
    }
  }
  return %string
}

alias -l parserange {
  var %input $1
  var %maxRange $2

  var %startNumber
  var %endNumber

  ;if the first character is a -, the first parameter is a negative number; proceed to second - or end of the string
  var %flag $iif($left(%input,1) == -,$true,$false)

  var %b $token(%input,1,45)

  var %input $iif(%flag,$right(%input,-1),%input)
  var %a $pos(%input,-,1)

  if %a == $len(%input) {
    ;second - as at end of string (range encountered) no second integer
    %startNumber = $iif(%flag,$calc(%maxRange - %b + 1),%b)
    %endNumber = %maxRange
  }
  else if !%a {
    ;no - after the first token; no range
    %startNumber = $iif(%flag,$calc(%maxRange - %b + 1),%b)
    %endNumber = %startNumber
  }
  else {
    ;range encountered; second number present
    var %startNumber $iif(%flag,$calc(%maxRange - %b + 1),%b)

    ;proceed to first - or end of string, and if there is a positive or negative integer

    var %a $iif($Pos(%input,-,1),$v1,0)
    var %b $iif($pos(%input,-,2),$v1,0)

    if %b > 0 && $calc(%b - %a) == 1 {
      ;second integer is negative,

      var %endNumber $calc(%maxRange - $token(%input,2,45) + 1)
    }
    else if %b == 0 {
      ;second integer is positive
      var %endnumber $token(%input,2,45)
    }
    else {
      ;unknown condition
      var %endnumber $token(%input,2,45)
    }
  }
  return %startNumber %endNumber
}

Here is an alias that allows you to replace the n'th occurence of the specified substring in the specified string with a token.

Here is a snippit of code that allow you to get tokens from bvars (binary variables).

to enhance jaytea's post:

each work with a dynamic number of parameters

alias gcd {
  while $2 {
    while $2 {
      tokenize 32 $2 $calc($1 % $2) $3-
    }
    tokenize 32 $1 $3-
  }
  return $1
}

alias lcm {
  while $2 {
    tokenize 32 $calc($1 * $2 / $gcd($1, $2)) $3-
  }
  return $1
}

seems like wims from swiftirc already has that covered ;)

http://forum.swiftirc.net/viewtopic.php?f=74&t=24548