I have to say, that is clever!
At first I smacked my forehead that after 2 years of daily Perl programming I had never thought "Duh! Variable width lookbehind is just variable width lookahead on the reverse string!".
Bravo!
Unfortunately, this solution does *not* recover empty fields delimited in this way... For example, try the example string above with two '@''s appended to the beginning (as you would find after having delimited empty fields).
See my post below for the correct way to handle this using loop-unrolling (in one regex and no lookaround!).
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