$alpha_P      = qr/ (??{$rule_1}) | (??{$rule_2}) /x;
$alpha_S      = qr/ (??{$rule_3}) /x;
$alpha_A      = qr/ (??{$rule_4}) | (??{$rule_5}) /x;
$alpha_N      = qr/ (??{$rule_6}) | (??{$rule_7}) /x;
$alpha_V      = qr/ (??{$rule_8}) /x;