use warnings;
use strict;

while (<DATA>) {
    chomp;
    my @numbers = unpack ("(a2)*", $_);

    print "unpacked: @numbers, ";

    @numbers = /(..)/g;
    print "matched: @numbers, ";

    @numbers = ();
    push @numbers, substr $_, 0, 2, '' while length $_;
    print "substr'd: @numbers\n";
}

__DATA__
0912203749
0725284648
0608294149
0622424347
1219303436
1729313449
1015162331