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Hmmm..
UPDATE That solves the original problem. ybiC pointed out that another format mac addresses come in has groups of 4 characters, separated by :. The amended question was whether both formats can be handled together. The following does that: In both cases the delimiter is gobbled by not being cached in a backref, and if it does not appear in even groups then a 0 will appear. Danger alert. In the pair "05" the 0 gets replaced, so if you wanted to use this to insert anything other than 0 you would need to not just check the truth of $1, but rather it's length.
Cheers, In reply to Simple RE answer
by tilly
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