That's some impressive abuse of code-eval-during-match, but sadly you're right in that it's not sutiable for production, especially when the real production system is sadly using regular expressions in that other language, and not perl.
And I'll note that the other language returned the matches I thought it should, although it took time on the order of 2**(size of trailing field). It started getting noticeable when we hit a case where the trailing field was 26 character long...
--
@/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/;
map{y/X_/\n /;print}map{pop@$_}@/for@/
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