FormAPI Recursion Assistance

System

I need a generic FormAPI function to find all items that match a given pattern, where the pattern would be something like "/container/replicant[]/container/replicant[]/field' where there could be any number of containers or replicants. I think the attached code works if there are no nested replicants, but my brain is not up to the recusion today. If anyone has some spare cycles I would appreciate your assistance.