作为RE正则表达式的一个最基本，又揽括了大部分知识点的例子程序。把程序运行一遍，然后再根据运行结果理解程序，将会迅速掌握re知识点。-As a basic regular expression RE, embrace include most of the knowledge of the example program. To run the program again, to understand the program and then run the results will quick