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  1. or download this
    m/^[[:xdigit:]]{8}-(?:[[:xdigit:]]{4}-){3}[[:xdigit:]]{12}$/
  2. or download this
    ($time_low) = $uuid =~ m/^([[:xdigit:]]{8})-(?:[[:xdigit:]]{4}-){3}[[:
+xdigit:]]{12}$/