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 1             //FileStream fs = new FileStream(@"C:\Users\Alex\Desktop\Task.txt", FileMode.Open, FileAccess.Read);

 2             //StreamReader sr = new StreamReader(fs);

 3 

 4             #region "Read Content"

 5             StreamReader sr = new StreamReader(@"C:\Users\Alex\Desktop\Task.txt", Encoding.GetEncoding("gb2312"));

 6             string content = sr.ReadToEnd();

 7 

 8             sr.Close();

 9 

10             Console.WriteLine(content);

11 

12             Regex rx = new Regex(@"1[3-8]\d{9}");

13             MatchCollection matches = rx.Matches(content);

14             Console.WriteLine(matches.Count);

15             foreach (Match match in matches)

16             {

17                 Console.WriteLine(match.Value);

18             }

19             Console.ReadKey();

20             #endregion