Csharp字符串和正则表达式参考手册

代码说明：

  此书讲了C#的字符串和正则表达式的详细内容，范围小而精，适合较高级编程人员使用和参考．(book stresses the C# and the string expression is the detailed content and scope of a small but efficient, suitable for the more senior programmers to use and reference.)