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  1. or download this
    0:13:46:b:4:31
^^             First pass
    ^^^^       Second pass
         ^^^   Third pass
  2. or download this
    $mac =~ s/(^|:)([0-9a-fA-F])(?=:|$)/${1}0$2/g;
  3. or download this
    $mac =~ s/(^|:)(?=[0-9a-fA-F](?::|$))/${1}0/g;
  4. or download this
    $mac =~ s/(?<=:)(?=[0-9a-fA-F](?::|$))/0/g;
$mac =~ s/^(?=[0-9a-fA-F](?::|$))/0/;
  5. or download this
            Rate orig fast
orig 36251/s   -- -42%
fast 62533/s  72%   --