如何在字符串中搜索特定子字符串并获取与该子字符串关联的数字？

Question

I am a newbie learning C# and this is the task at hand: I have a text file with a some JSON in it. In the text file there are multiple lines and each paragraph is separated from the next through an empty line.

I want to get the number associated with the substring "Label " + number. See below.

This is an example of the input from the text file:

{"menu": {"header": "menu", "items": [{"id": 27}, {"id": 0, "label": "Label 0"}, null, {"id": 93}, {"id": 85}, {"id": 54}, null, {"id": 46, "label": "Label 46"}]}}

{"menu": {"header": "menu", "items": [{"id": 81}]}}

{"menu": {"header": "menu", "items": [{"id": 70, "label": "Label 70"}, {"id": 85, "label": "Label 85"}, {"id": 93, "label": "Label 93"}, {"id": 2}]}}

What I've done so far is:

        static void Main(string[] args)
    {

        string path = @"C:\Users\X\Desktop\docomentul.txt";
        string jSONstring;

        string resultString;
        string labelString = "Label ";


        using (StreamReader reader = File.OpenText(path))
        {
            jSONstring = reader.ReadToEnd();

            var jSONlines = Regex.Split(jSONstring,"(?m)^\\s*$");

            
            foreach (var line in jSONlines)
            {
                resultString = Regex.Match(line, @"\d+").Value;
                Console.WriteLine(resultString);
            }
        }

        Console.ReadKey();
    }

Now this only brings back the first occurrence of a number in the string. What I want is to find each occurrence of the numbers associated with the substring "Label ". At least that is how I planned on solving this. However I don't really know how to use REGEX nor how to find it in another way.

Once I get the numbers associated with the substring "Label ", I will have to add them for each item and then print out the sum for each string in the array (or paragraph).

The output for the test input should be:
46
0
248

Answer 1

        string json = YOUR_JSON_STRING;
        string[] arrayStrings = json.Split("Label ");
        List<int> lst = new List<int>();
        foreach (string str in arrayStrings)
        {
            lst.Add(Convert.ToInt16(str.Substring(0, str.IndexOf("\"") - 1)));
        }
        //lst now contains all the numbers for you!

Keep coding!