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Social-security-number matching

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("[0-9]{3}-[0-9]{2}-[0-9]{4}");                  string s = "011-01-0111";         string s2 = "abc-01-0111";                  Console.WriteLine(r1.ToString());         Console.WriteLine(r1.IsMatch(s));          Console.WriteLine(s2);         Console.WriteLine(r1.IsMatch(s2));    } } [0-9]{3}-[0-9]{2}-[0-9]{4} True abc-01-0111 False