Regular Expression C# Tutorial

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  4. New Regex((abc))x(1)
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;
using System.Reflection;
public class MainClass{
   public static void Main(){
        Regex r1 = new Regex(@"((abc)*)x(\1)");
        string s1 = "abcabcabcxabc";
        Console.WriteLine(r1.IsMatch(s1) + "..." + r1.Match(s1).Value);
   }
}
True...abcxabc