说明：  c++正则表达式代码，只要一个头文件，完美实现正则表达式，非常方便的实现了正则表达式的大部分功能，非常好用，强烈推荐。 好东西大家分享。
(C + + code regular expressions, as long as a header file, perfect realization of regular expressions, very convenient to realize the function of most of the regular expression, is very nice, it is highly recommended. A good thing to share.)