From the top of my head: 
$count = () = map /y/g, /<.*?>/g;

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A little more complex, but possibly a little more memory friendly, is: 
use List::Util 'sum';
$count = sum map { my $x = () = /y/g } /<.*?>/g;

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In reply to Re: Regexes: finding ALL matches (including overlap) by bart
in thread Regexes: finding ALL matches (including overlap) by kaif

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