In the spirit of "match the regex to get the number of parens in it", here's another way: 
sub nparens { "" =~ /|$_[0]/ and $#+ }

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Count capturing parentheses in a compiled regexp by japhy
in thread Count capturing parentheses in a compiled regexp by BooK

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