The %allowed hash doesn't look right ...
I would be more concerned about the map statement:
c:\@Work\Perl>perl -wMstrict -le
"my $expr = '(!(C)&T)&!Q';
my %allowed = qw{ ( ( ) ) ! !! & && C 1 T 1 Q 1 };
my $finalExpr = map { $allowed{$_} || die qq{not allowed '$_'} } spli
+t '', $expr;
print qq{'$finalExpr'};
"
'11'
Give a man a fish: <%-{-{-{-<
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