m/^[[:xdigit:]]{8}-(?:[[:xdigit:]]{4}-){3}[[:xdigit:]]{12}$/
Humbly submitted.
Fun activity: add groupings to parse bits (words) of it out if you're so inclined. (See RFC 4122 for the bits' meanings. Also likely better done through unpack, but I warned you this was a fun activity.)
($time_low) = $uuid =~ m/^([[:xdigit:]]{8})-(?:[[:xdigit:]]{4}-){3}[[:
+xdigit:]]{12}$/
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