ReadingJsonValueByRegex, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var json = @"{
    ""PL_DATA_HL_XYZ"": [
        {
          ""name"": ""$.properties.start"",
          ""value"": ""new password""
        },
        {
          ""name"": ""$.properties.end"",
          ""value"": ""2017-04-20T00:30:00Z""
        },
    ],
    ""PL_DATA_IL_HGF"": [
        {
          ""name"": ""$.properties.start"",
          ""value"": ""2017-05-21T01:00:00Z""
        },
        {
          ""name"": ""$.properties.end"",
          ""value"": ""2017-05-21T01:00:00Z""
        },
    ],
    ""PL_DATA_HL_ABC"": [
        {
          ""name"": ""$.properties.start"",
          ""value"": ""new password""
        },
        {
          ""name"": ""$.properties.end"",
          ""value"": ""2017-04-20T00:30:00Z""
        },
    ],
 }";
            var nodes =
                Regex.Matches(json, @"""PL_DATA_HL[^]]+]")
                    .OfType<Match>()
                    .SelectMany(c=> Regex.Matches(c.ToString(), @"(?<=""value"")\s*:\s*""(?<value>[^""]+)""")
                    .OfType<Match>().Select(m=> m.Groups["value"].ToString()))
                    .ToList();
            
            Console.WriteLine(string.Join(", ", nodes));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,19 sec, cpu time: 0,17 sec, average memory usage: 17 Mb, average nr of threads: 4