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Matches a valid MAC address.
Contributed by @itsbrunodev
^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$
# Valid MAC addresses 00:1A:2B:3C:4D:5E FF:FF:FF:FF:FF:FF # Invalid MAC addresses 00:1A:2B:3C:4D G1:1A:2B:3C:4D:5E