You probably need to consider more than just the one character. Otherwise, multiple strings with the same fourth-character would have an unpredictable result-order, since differing strings would all be seen as “equal.”
You have to upgrade your Perl!

sort

In 5.7, the quicksort implementation was replaced with a stable mergesort algorithm

In reply to Re^2: How to perform different sorts on multiple sections of items in the same array by Anonymous Monk
in thread How to perform different sorts on multiple sections of items in the same array by estreb

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