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/gist:1198964
Created Sep 6, 2011

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my $id = 'ZywYdtlIl8amEGe-Rq8xTg';
use MIME::Base64;
$id =~ tr{_-}{+/};
$id .= 'AA';
my $bin_id = decode_base64($id);
my $hex_id = unpack("H*", $bin_id);
$hex_id =~ s/0{3,4}$//;
# print $hex_id
my @parts = ($hex_id =~ m/^((.{2})(.{2}).+)/)[1,2,0];
print map "$_\n", join '/', @parts;
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