To get round your problem you could of course also 
my @mac_bits = $mac =~ /\G ( [0-9A-Z]{1,2} ) (?: :|$ ) /igx;
print 'no MAC address' unless (@mac_bits == 6);

[download]

-- Hofmator

In reply to Re: Capturing brackets within a repeat group by Hofmator
in thread Capturing brackets within a repeat group by BrowserUk

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