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  1. or download this
    0:13:46:b:4:31    # input
00:13:46:0b:04:31 # expected output
  2. or download this
    $mac =~ s/(^|:)([\da-f])(:|$)/${1}0${2}${3}/g;
  3. or download this
    0:13:46:b:4:31    # input
00:13:46:0b:4:31  # produced
00:13:46:0b:04:31 # expected
  4. or download this
    my @parts = split /:/ , $mac;
foreach (@parts) { if (length == 1) { $_ = "0" . $_; } }
$mac = join ":" , @parts;