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python - 正则表达式不会子字符 '\\'

问题描述

我想从我的字符串中删除字符 \\。我试过 regextester 并且它匹配，https: //regex101.com/r/euGZsQ/1 

 s = '''That\\'s not true. There are a range of causes. There are a        range of issues that we have to address. First of all, we have to identify, share and accept that there is a problem and that we\\''''

 pattern = re.compile(r'\\{2,}')
 re.sub(pattern, '', s)

我希望 sub 方法用什么来替换我的 \\ 来清理我的字符串。

标签： pythonregex

解决方案

问题是您的字符串本身未标记为原始字符串。因此，第一个\实际上逃脱了第二个。

观察：

import re

pattern = re.compile(r'\\{2,}')
s = r'''That\\'s not true. There are a range of causes. There are a        range of issues that we have to address. First of all, we have to identify, share and accept that there is a problem and that we\\'''
re.sub(pattern, '', s)

输出：

"That's not true. There are a range of causes. There are a        range of issues that we have to address. First of all, we have to identify, share and accept that there is a problem and that we"

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