使用说明：https://help.autodesk.com/view/MAXDEV/2022/ENU/?guid=GUID-A6A60FC7-6206-4FFC-80E2-0EF8544BE2C4

findString "Thanks for all the fish!" "all" 
-- returns 12 

filterString "MAX Script, is-dead-funky" ", -"
#("MAX","Script","is","dead","funky")

s="1234567890"
s1=replace s 5 3 "inserted string"
-- returns "1234inserted string890"

s ="Balerofon"
ss = substring s 5 3-- returns "rof"
ss = substring s 5 -1-- returns "rofon"
ss = substring s 5 100-- returns "rofon"