C:\>perl -E "my $input='#abcd#ef#ghi#jklmnopqrstuv'; my @chunks = split(/[a-z]{3}/,$input); use Data::Dumper; say Dumper @chunks;"
$VAR1 = '#';
$VAR2 = 'd#ef#';
$VAR3 = '#';
$VAR4 = '';
$VAR5 = '';
$VAR6 = '';
$VAR7 = 'v';