Question

string str = "var rawItemInfo={\"stock\":\"In stock. Limit 5 per customer.\",\"shipping\":\"$19.99 Shipping\",\"finalPrice\":\"139.99\",\"itemInfo\":\"<div class=\"grpPricing\"";
var regPattern = "stock\":\"(.*?)\",\".*?shipping\":\"(.*?)\",\".*?finalPrice\":\"(.*?)\"";
Regex regex = new Regex(regPattern);
var data = regex.Match(str);

string val1 = data.Groups[1].Value.ToString();  // In stock. Limit 5 per customer.
string val2 = data.Groups[2].Value.ToString();  // $19.99 Shipping
string val3 = data.Groups[3].Value.ToString();  // 139.99

如何编辑正则表达式以从运费中提取19.99？目前，它正在给我“$19.99 Shipping”。任何帮助将不胜感激。

记住！运送也可以这样"shipping\":\"free Shipping\"

Answer 1

var regPattern = "stock\":\"(.*?)\",\".*?shipping\":\"(?:(?:\\$([0-9]*\\.[0-9]*)|(free Shipping)).*?)\",\".*?finalPrice\":\"(.*?)\"";

string val1 = data.Groups[1].Value.ToString();  // In stock. Limit 5 per customer.
string val2 = data.Groups[2].Value.ToString();  // 19.99 
string val3 = data.Groups[3].Value.ToString();  // free Shipping            
string val4 = data.Groups[4].Value.ToString();  // 139.99

只有val2和val3中的一个将被赋值（另一个将是String.Empty）

如果您的送货始终是123.456（因此在。之后总会有一些数字。和之后的一些数字。）

Answer 2

更新

在切割和其他一些技术困难（即缺乏咖啡因 - 延长“二十三感觉”）方面遇到了一些麻烦。以下是解决方案的全部内容：

using System;
using System.Text.RegularExpressions;

public class Test
{
        public static void Main()
        {
                String s = "var rawItemInfo={\"stock\":\"In stock. Limit 5 per customer.\",\"shipping\":\"$19.99 Shipping\",\"finalPrice\":\"139.99\",\"itemInfo\":\"<div class=\"grpPricing\"";
                Console.WriteLine("Testing '{0}'", s);
                test(s);

                Console.WriteLine();

                s = "var rawItemInfo={\"stock\":\"In stock. Limit 5 per customer.\",\"shipping\":\"free Shipping\",\"finalPrice\":\"139.99\",\"itemInfo\":\"<div class=\"grpPricing\"";
                Console.WriteLine("Testing '{0}'", s);
                test(s);
        }

        public static void test(String s)
        {
                String p = "stock\":\"(.*?)\",\".*?shipping\":\"(.*?)\",\".*?finalPrice\":\"(.*?)\"";
                // modification
                p = "stock\":\"(.*?)\",\".*?shipping\":\"(\\$([\\d\\.]+)|(free))\\s?(.*?)\",\".*?finalPrice\":\"(.*?)\"";

                Regex regex = new Regex(p);
                var data = regex.Match(s);

                for (Int32 i = 0; i < data.Groups.Count; i++)
                        Console.WriteLine("{0}. {1}", i, data.Groups[i].Value);

                Console.WriteLine("Price is {0}", data.Groups[2].Value.Equals("free")?"FREE":data.Groups[3].Value);
        }
}

使用的实际模式：

"stock\":\"(.*?)\",\".*?shipping\":\"(\\$([\\d\\.]+)|(free))\\s?(.*?)\",\".*?finalPrice\":\"(.*?)\""

结果排队：

Group #     Sample Data                         Notes
0           (whole string)                      [both]
1           In stock. Limit 5 per customer.     [both]
2           free/$19.99                         [free/with price]
3.          19.99                               [populated only for price]
4.          free                                [populated only for free]
5.          Shipping                            [both]
6.          139.99                              [both]

以上代码的示例输出：

Testing 'var rawItemInfo={"stock":"In stock. Limit 5 per customer.","shipping":"$19.99 Shipping","finalPrice":"139.99","itemInfo":"<div class="grpPricing"'
0. stock":"In stock. Limit 5 per customer.","shipping":"$19.99 Shipping","finalPrice":"139.99"
1. In stock. Limit 5 per customer.
2. $19.99
3. 19.99
4. 
5. Shipping
6. 139.99
Price is 19.99

Testing 'var rawItemInfo={"stock":"In stock. Limit 5 per customer.","shipping":"free Shipping","finalPrice":"139.99","itemInfo":"<div class="grpPricing"'
0. stock":"In stock. Limit 5 per customer.","shipping":"free Shipping","finalPrice":"139.99"
1. In stock. Limit 5 per customer.
2. free
3. 
4. free
5. Shipping
6. 139.99
Price is FREE

Answer 3

您只需要在其中的正确位置\$?：

var regPattern = "stock\":\"(.*?)\",\".*?shipping\":\"\\$?(.*?) .*?\",\".*?finalPrice\":\"(.*?)\"";

Answer 4

通用解决方案怎么样？

string str = String.Concat(
    "var rawItemInfo={",
    string.Join(",", "\"stock\":\"In stock. Limit 5 per customer.\"",
                     "\"shipping\":\"$19.99 Shipping\"",
                     "\"finalPrice\":\"139.99\"",
                     "\"itemInfo\":\"<div class=\\\"grpPricing\\\" />\""),
    "}");

// recognize a JSON* object
var item = @"""(?<key>[^""]+)""\s*:\s*""(?<value>(?:[^\\""]|\\"")+)""";
var jsonRe = new Regex(@"\{\s*" + item + @"(?:\s*,\s*" + item + @")*\s*\}", RegexOptions.Compiled);
var m = jsonRe.Match(str);

// build the corresponding dictionary
var json = new System.Collections.Specialized.StringDictionary();
if (m.Success)
{
    int captures = m.Groups["key"].Captures.Count;
    for (int i = 0; i < captures; i++)
    {
        json[m.Groups["key"].Captures[i].Value] = m.Groups["value"].Captures[i].Value;
    }
}

// get the values
var val1 = json["stock"];       // "In stock. Limit 5 per customer."
var val2 = json["shipping"];    // "$19.99 Shipping"
var val3 = json["finalPrice"];  // "139.99"

// extract price from val2
val2 = Regex.Replace(val2, @"(?:\$(\d+\.\d{2})|(free)) Shipping", @"$1"); // "19.99"

_{* p.s.，“JSON”是正确的术语吗？}

正则表达式提取运输成本

4 个答案:

更新