Thank you for providing a solution, which I think I understand. Please correct me if I am wrong.

The (?{ [] }) at the start of $rxOnlyNested creates an empty list reference and the reference will be held in $^R (the result of the last code block). In $rxNest the (?{ [ @{$^R}, $1 ] }) at the end creates a new list reference which contains the dereferenced contents of the last list plus the memory group of the successful match. This list keeps growing as the regular expression recursed, in effect. Finally, in $rxOnlyNested the list is dereferenced and assigned to @memoList.

I hope I have understood correctly and if it is doing what I think it is doing, it is a very neat solution. I am glad I have finally started visiting the Monastery as I am learning a lot of new techniques.

Cheers,

JohnGG

In reply to Re^2: Recursive regular expression weirdness by johngg
in thread Recursive regular expression weirdness by johngg

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