PHP, помогите с регуляркой

Поле чудес спешит на помощь!

$str = '{"СписокЗначений",{{{"Строка","КамАЗ"},"","0"},{{"Строка","BPW"},"","0"}}}';
preg_match_all('/\{"Строка","(?<aaaaaavtomobiiiil>[^"]+)"\}/', $str, $matches);
echo implode(",", $matches['aaaaaavtomobiiiil']);
// КамАЗ,BPW

Главное - ключевое слово "Аааавтомобиииль"!

Просто ради варианта

$text = '{"СписокЗначений",{{{"Строка","КамАЗ"},"","0"},{{"Строка","BPW"},"","0"}}}';
$text = str_replace(['{','}'], ['[',']'], $text);
$array = eval("return $text;");
$cars = [];
foreach($array[1] as $value){
    $cars[] = $value[0][1];
}
echo implode(",", $cars);