c# - How to search string for a specific substring and get a number associated with that substring? -

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i newbie learning c# , task @ hand: have text file json in it. in text file there multiple lines , each paragraph separated next through empty line.

i want number associated substring "label " + number. see below.

this example of input 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 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 brings first occurrence of number in string. want find each occurrence of numbers associated substring "label ". @ least how planned on solving this. don't know how use regex nor how find in way.

once numbers associated substring "label ", have add them each item , print out sum each string in array (or paragraph).

the output test input should be:
46
0
248


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