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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