'Appends newItem to the end of strList, using the 'delim' delimiter
'doesn't perform any checks, returns the new list
'
function ListAppend(strList, newItem, delim)
 ListAppend = strList & delim & newItem
end function


'Adds newItem to the end of the list, using the 'delim' delimiter, only if newItem
'isn't already in the list. Returns the new list if the item was added, original list 
'if the item was already present
'
function ListAdd(strList, newItem, delim)
  if instr(strList, newItem) then
    ListAdd = strList
  else
    strList = strList & delim & newItem
    ListAdd = strList
 end if
end function


'Removes the removeItem from the list if it is present there,
'returns the new list if the item was removed, original list if the item wasn't
'found.
'
function ListRemove(strList, removeItem, delim)
dim startPos, endPos, resultList
startPos = instr(strList, removeItem)

 if startPos then
  endPos = instr(startPos, strList, delim)
   if endPos then
    resultList = Left(strList, startPos - 1) + Right(strList, len(strList) - endPos)
    ListRemove = resultList
  else 
    resultList = Left(strList, startPos - 1)
    ListRemove = resultList
  end if
 else
  ListRemove = strList
 end if
end function


'Example of usage:

dim mobList
mobList = "orc_dragon_cat"

sub TestLists(name, output, wildcs)
  'Add "dog" to the mobList
  mobList =  ListAdd(mobList, "dog", "_") 
  world.Note mobList
  'Remove "cat" from the mobList
  mobList = ListRemove(mobList, "cat", "_")
  world.Note mobList
  'Add "cat" back to the list
  mobList = ListAdd(mobList, "cat", "_")
  world.Note mobList
  'Remove "urchin" from the list, it's not there so the list isn't changed
  mobList = ListRemove(mobList, "urchin", "_")
  world.Note mobList
  'Appends another "cat" to the end of the list
  mobList = ListAppend(mobList, "cat", "_")
  world.Note mobList
end sub

v = "orc, troll, dragon, cat, chicken, dog"

mylist = split (v, ",")

for each m in mylist
  Note trim (m)
next


Output
orc
troll
dragon
cat
chicken
dog

k = join (mylist, ",")
Note k

Output

orc, troll, dragon, cat, chicken, dog