Quoted from Jethro_:
There is no such identifier as $isalnum unless you have a custom alias for it, which I don't see it in your script.

From mIRC Help file:
The Operators

isin string v1 is in string v2
isincs string v1 is in string v2 (case sensitive)
iswm wildcard string v1 matches string v2
iswmcs wildcard string v1 matches string v2 (case sensitive)
isnum number v1 is a number in the range v2 which is in the form n1-n2 (v2 optional)
isletter letter v1 is a letter in the list of letters in v2 (v2 optional)
isalnum text contains only letters and numbers
isalpha text contains only letters
islower text contains only lower case letters
isupper text contains only upper case letters

That style of array is very nifty, however i think i will stick to if-elseif... for this, but i will definately use that style of array in the future, thanks for the tip

and if ($2 = !$isalnum) is an older form of coding, does the same job just a different way to do it