using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string comment = "1,5,15,test";

        List<int> areas = new List<int>();

        var test = Regex.Split(comment, @"\D+").ToList();

        areas = test.Where(s=>!String.IsNullOrEmpty(s)).Select(Int32.Parse).ToList();

        foreach (string s in test){

        Console.WriteLine("s:" + s);

        }

    }

}