s/((.)\1{2})\1+/$2/g

I think you might have mixed up your '1's and '2's.

use strict;
use warnings;

my $str = q{aabbbbcddddddee};
print qq{Starting string\n  $str\n};

# Your regex.
$str =~ s/((.)\1{2})\1+/$2/g;
print qq{Original regex\n  $str\n};

# I think this is correct.
$str = q{aabbbbcddddddee};
$str =~ s/((.)\2{2})\2+/$1/g;
print qq{Corrected regex\n  $str\n};

[download]

Produces

Starting string
  aabbbbcddddddee
Original regex
  aabbbbcddddddee
Corrected regex
  aabbbcdddee

[download]

This might affect the benchmark a little.

Cheers,

JohnGG

In reply to Re^2: More efficient way to truncate long strings of the same character by johngg
in thread More efficient way to truncate long strings of the same character by kurtis

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