It certainly doesn't match the code in the link provided.
Sorry. Link was wrong but code is OK.
Good link http://golf.shinh.org/reveal.rb?Bisection/tails+%28%3F%29_1377006539&pl
In reply to Re^3: strange usage of s///
by brx
in thread strange usage of s/// [solved: Perl 5.14 and 5.16 bug]
by brx
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