문자열 위치찾기

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string factMessage = "Extension methods have all the capabilities of regular static methods.";
            //문자열안에서 특정문자열이 있다면 처음 idx return, c++의 find
            int first = factMessage.IndexOf("methods") + "methods".Length;
            int last = factMessage.LastIndexOf("methods");
            //문자열 끊기, 여기에서는 특정문자열이 없는 부분만 끊었다. c++의 string.substr()
            string str2 = factMessage.Substring(first, last - first);

            Console.WriteLine("{0}, {1}", first, last);
            Console.WriteLine(str2);
            Console.WriteLine(factMessage.Length);
        }
    }
}