#!/usr/bin/perl -w
use strict;
use Data::Dumper;

my $sentence="BEARCALFDEERFEARGEARHEAR";
print Dumper (split /(.{4})/,$sentence);
__END__
$VAR1 = '';
$VAR2 = 'BEAR';
$VAR3 = '';
$VAR4 = 'CALF';
$VAR5 = '';
$VAR6 = 'DEER';
$VAR7 = '';
$VAR8 = 'FEAR';
$VAR9 = '';
$VAR10 = 'GEAR';
$VAR11 = '';
$VAR12 = 'HEAR';