in reply to Explained: Trying to count the captures in a compiled regular expression
in thread Trying to count the captures in a compiled regular expression

That runs in scalar context, so won't work; try: 
$matches = (() = /($regex)??/) - 1;

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Re: Re: Explained: Trying to count the captures in a compiled regular expression
by Roy Johnson (Monsignor) on May 03, 2004 at 17:41 UTC
    or even 
    /$regex??/;
print "There were $#+ groupings\n";

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