For that very specific regexp, yes. That's the simplification to which I alluded. I'll repeat the reason I didn't post the simplification
It's much safer to assume there's always the possibility of backtracking through any (?{...}). That's why $^R is used.
It's too easy to miss a case where backtracking can occur.
For example,
/ $text (?: \s (\w+) (?{ push @matches, $^N }) ){2,} / is wrong.
/ $text (?: \s (\w+) (?{ push @matches, $^N }) )+ ... / is wrong.
/ $text (?: \s (\w+) (?{ push @matches, $^N }) ... )+ / is wrong.
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