using System;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
        string pattern = @"=[""^]";
        string line = @"""METHOD=""AES-128"",URI=""path?key1=value1&key2=value2""";
		var values = line.Split(',');
		foreach(var entry in values)
		{
			var data = Regex.Split(entry, pattern);
			var key = data.First().Trim('"');
			var value = data.Last().Trim('"');
			Console.WriteLine("Key: {0}, Value: {1}", key, value);
		}
	}
}

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