RegexdrillMAC addresses
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
The whole line must match. Match a MAC address: six pairs of hex digits (0 to 9, a to f, either case) separated by colons, like 00:1A:2b:3C:4d:5E.
What this exercise teaches
(?:[0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2} counts the pairs exactly. \w{2} would let g through, and a class like [0-9A-Fa-f:]{17} would accept the colons in the wrong places.
A hint if you get stuck
Repeat a group of two hex digits and a colon five times, then add the last pair without a colon.
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