safety first 
my %allowed = qw{ ( ( ) ) ! !! & &&  };
my $finalExpr = map { $allowed{$_} || die "not allowed '$_'" } split '
+', $expr;
my $result = eval $finalExpr;

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In reply to Re: Logic expression evaluation not working. What am I doing wrong? by Anonymous Monk
in thread Logic expression evaluation not working. What am I doing wrong? by perl_learner_2016

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