using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Diagnostics;
using System.Net;
using System.Text;
using System.Configuration;
using System.Text.RegularExpressions;
 
namespace ProgramConsole
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string chars = "091";
            string ss = "763091d44a0914";
            IList<int> indexes = new List<int>();
            foreach ( Match match in Regex.Matches(ss, chars) )
            {
                indexes.Add(match.Index);
            }
 
            for (int i = 0; i < indexes.Count; i++)
            {
                Console.WriteLine("{0}. match in index {1}", i+1, indexes[i]);
            }
        }  
    }
 
}

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