这个软件是关于函数调用关系分析工具，希望大家满意哦~！-The software is on the relationship between function call analysis tools

词法分析器。对任何正则表达式，构造DFA，并画出DFA的图。需要Graphviz的画图软件配合-Lexical parsers. For any regular expressions, the tectonic DFA and draw the DFA picture