My craziest regex:
use re 'eval';
my $string = "abc";
my $length = length $string;
my $regex
= qr/(\G[$string]{0,$length}(?{print "# [$&][$'][$string]\n"}))/ x
+ 2;
$string =~ $regex;
Bonus points if you can figure out why I wrote that. As a fun exercise, try to figure out what it does and how it does it.
Of course, this forking regular expression might top it. Since the regex engine is not re-entrant, if you need that power, you have to fork.
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