import re buffer_ = open('input.txt', 'rb').read() p = re.compile(r'(tengig.*?(?:\n+)?\bmtu\b.*?(?:\n+)?\bcarrier-delay\b[^\n]+)', re.MULTILINE | re.IGNORECASE) print(re.findall(p, buffer_))
Standard input is empty
Standard output is empty
Traceback (most recent call last): File "./prog.py", line 3, in <module> FileNotFoundError: [Errno 2] No such file or directory: 'input.txt'