Python：当从文件中读取Input时，如何使此正则表达式工作

>>> line = '\xc2d sdsdfdslkfsdkfjdsf'
>>> pattern_strings = ['\xc2d', '\xe9']
>>> pattern = '|'.join(pattern_strings)
>>> pattern
'\xc2d|\xe9'
>>> import re
>>> re.findall(pattern, line)
['\xc2d']
>>> line = '\xc2d sdsdfdslkfsdkfjdsf'
>>> patte