正则表达式不会子字符'\\' [重复]答案

【问题标题】：Regex will not sub characters '\\' [duplicate]正则表达式不会子字符'\\' [重复]
【发布时间】：2019-06-10 06:38:16
【问题描述】：

我想从我的字符串中删除字符 \\。我试过 regextester 并且匹配，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。

【问题讨论】：

如果只想删除 '\\' 为什么不替换它呢？ s.replace("\\\\", "")

标签： python regex

【解决方案1】：

问题是您的 字符串本身 没有被标记为原始字符串。因此，第一个 \ 实际上转义了第二个。

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"

【讨论】：

很好用，可用时接受。但是，我的实际用例是从带有s = r' '.join(s) 的列表转换而来的字符串。转换为原始字符串并不能解决这个问题。
@franticoreo 你怎么知道你的字符串实际上有两个反斜杠？请注意，每个反斜杠将被打印两次。尝试从正则表达式中删除 {2,} 或仅使用 .replace('\\', '')。
@franticoreo 请注意r''.join(...) 与''.join(...) 相同。 “原始字符串”仅具有 literal 的含义。

【解决方案2】：

你可以试试：

import re
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\\' '''
d = re.sub(r'\\', '', s)
print(d)

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'

【讨论】：

请注意，这也将匹配单个反斜杠。