说明：  这个是串模式匹配的类定义和实现的c++程序。程序首先给出了串模式匹配的的定义，接着给出了它的实现，最后测试，输出结果。 FindSub.cpp就是程序 FindSub.txt是运行结果
(the string pattern matching is the type definition and realization of the c procedures. First procedures given the string pattern matching, the definition given it the realization of the final test, and the output results. FindSub.cpp procedure is FindSub.txt is running results)