I'm trying to parse out an imbedded token within a token.

[Table:Value]

Well now we want to do:

[[Table1:Value1]:[Table2:Value2]]

So basically I want it to:
a = [Table1:Value1]
b = [Table2:Value2]

c= [a:b]

Regex pattern = (?<=\[{3})[^}]*(?=\]{3})

Anyone have an idea to find the inner first then find the outer?