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  1. or download this
    my $foo = "0:0A:0C:B:B8:F";
$foo =~ s/([0-9A-F])+:?/length($1) < 2?"0$1":$1/ge;
  2. or download this
    my $foo = "0:0A:0C:B:B8:F";
$foo =~ s/([0-9A-F]+):?/length($1) < 2?"0$1":$1/ge;