Could anyone explain the role of the numbers in the following, I'm OK with the words as it seems to return part of a string but thats the limit of my knowledge. I have been unable to find an explanation in any tutorials.
code:
$(upper,$(substr, $(getvar, "dwgprefix")$(getvar, "dwgname"), $(+, 5, $(*, 16, $(eq, $(substr, $(getvar, "dwgprefix"), 7, 1), "-")))))