Wish I could ++ your solution repeatedly! This writeup led to a "Eureka!" moment; the kind of haze-clearing that makes PM so valuable to beginners like me.
request: please add to our understanding by commenting lines of regex, esp that part of line8 reading
(grouped but non-capture??)
and in line13,
( [^\+ )
which, as I read Owl (pocket ref), means capture one-or-more of a class including not-an-open_BRKT and close_BRKT ...which doesn't make sense to me, and -- more importantly, doesn't seem to WORK that way.
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