@Ievgen
Вот регулярное выражение "maxQuantity":(\d+),
Вот текст примерный (false,"isLargeItem":false,"couponSale":30,"id":43909427,"canBeOrdered":true,"cod1S":14968472,"characteristicId":43909427,"goodsName":"Смарт часы мужские, умные часы водонипроницаемые для телефона Android iOS круглые","colorName":"черный","colorsetName":null,"sizeName":"0","brandName":"I-Goods","partQuantity":0,"quantity":1,"maxQuantity":171,"minQuantity":1,"sale":51,"personalDiscount":0,"paymentSale":0,"hasOtherSizes":false,"storeName":"Коледино","impossibleDeliveryMsg":null,"price":9890,"priceWithSale":4846,"priceWithCoupon":3392,"priceWithCouponAndSpp":0,"priceWithCouponAndDiscount":3392,"priceSum":9890,"priceSumWithCouponAndDiscount":3392,"couponNumber":null,"couponSource":0,"couponDescFull":"Промокод","couponDescShort":"Промокод","includeInOrder":true,"onStock":1,"targetUrl":"SP"" )