我正在尝试从字段中提取子字符串（“ groceryGateway”）。我正在使用grok和logstash，但遇到了麻烦。
我尝试使用grok中提供的模式，但无法提取所需的子字符串。
{
"@timestamp" => 2019-07-29T16:35:54.256Z,
"host" => "MacBook-Pro-51.local",
"@version" => "1",
"message" => "Iogo 0% Multi Pack With Stevia Strawberry/Blueberry/Vanilla/Mango,5.99, 16x100g,https://www.grocerygateway.com/store/groceryGateway/en/Yogurt-and-Cottage-Cheese/Multi-Pack/Iogo-0%25-Multi-Pack-With-Stevia-Strawberry-Blueberry-Vanilla-Mango/p/00629025420053\r",
"name" => "Iogo 0% Multi Pack With Stevia Strawberry/Blueberry/Vanilla/Mango",
"path" => "/Users/kevinliu/Desktop/Wanda/thanos/output_data/grocery_gateway-2019-07-25_16:17.csv",
"type" => "grocery_item",
"unit" => " 16x100g",
"url" => "https://www.grocerygateway.com/store/groceryGateway/en/Yogurt-and-Cottage-Cheese/Multi-Pack/Iogo-0%25-Multi-Pack-With-Stevia-Strawberry-Blueberry-Vanilla-Mango/p/00629025420053",
"test" => "0",
"price" => "5.99"
}