There are many ways to do this. I would propose a repeated split instead of a regex. First split on ][, then for each of the results split on |, take the fourth element and split that on +. Sounds more complicated than it is:

use strict;
use warnings;
use Data::Dumper;

my $data = '[-3|1|29x250+46+26|200+300+464|Get][-3|1|29x250+46+26|132+
+100+244|come][-3|1|29x250+46+26|220+124+432|Go]';
my @splitted =  map { [ split /\+/, (split /\|/)[3] ] } split /]\[/, $
+data;
print Dumper \@splitted;
[download]

As a result you get

$VAR1 = [
          [
            '200',
            '300',
            '464'
          ],
          [
            '132',
            '100',
            '244'
          ],
          [
            '220',
            '124',
            '432'
          ]
        ];
[download]

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