정규식 뭐 잘못된거임?

ㅈㄴ 뭐가 뭔지도 모르겠다 ㅅㅂ

g++.exe: error: training: No such file or directory

g++.exe: error: 8-2.cpp: No such file or directory

g++.exe: error: 8-2: No such file or directory

g++.exe: fatal error: no input files

compilation terminated.