由正则表达式构造NFA的程序，并可以对输入串模拟正则表达式匹配-This is a C program used in compiling the given regular expression into an equivalent epsilon-NFA, simulated through tracking State sets.

用C++写的修改批量修改文件名字的工具，可用正则表达式来匹配修改-Written in C++, modify the batch file name to modify the tools available to modify the regular expression to match