regex
.....\a.out
.....\backup2
.....\.......\regex.cpp
.....\.......\regex.h
.....\.......\state.h
.....\dfa.dot
.....\ex7.1.png
.....\ex7.2.png
.....\ex7.3.png
.....\ex7.4.png
.....\nfa.dot
.....\regex.cpp
.....\regex.dot
.....\regex.h
.....\state.h