I would rather use:

$i++ while $pars =~ s/\(([^()]*)\)/$1/;

Better way is to use Regexp::Common and balanced pattern (not tested):

use Regexp::Common;
$pars =~ /^[^()]*$RE{balanced}{-parens=>'()'}[^()]*$/

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In reply to Re^3: AND and OR on Regular Expressions by grizzley
in thread AND and OR on Regular Expressions by vitoco

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