python 正则表达式去掉反斜杠

Question

通过这段代码我得到:

newContent='asdf asdf \nOUTPUT_DIRECTORY       = working\topOnly'

我希望它是:

newContent='asdf asdf \nOUTPUT_DIRECTORY       = working\\topOnly'

reg ex 正在删除 """working""" 和 """topOnly"""之间的 """\""" 。如果我执行类似 """valStr = 'working\\ytopOnly'""" 的操作，那么它会按预期工作。

我需要对代码进行哪些更改才能达到预期效果？

import re

valStr = 'working\\topOnly'
cmdFileContent = 'asdf asdf \nOUTPUT_DIRECTORY       = asdf'
name = 'OUTPUT_DIRECTORY'

varRegEx = r"""
    (\n          #match new line
    %s            #var
    \s*           #skip white spaces
    =
    \s?)          #skip white spaces
    (.*)          #match and store rest of line
    """%name

newContent  = re.compile(varRegEx, re.VERBOSE).sub(r'\1%s'%valStr, cmdFileContent)

Answer 1

re.sub 的帮助说:

repl can be either a string or a callable; if a string, backslash escapes in it are processed.

由于它正在执行自己的处理转义层，因此您将需要另一层转义:

newContent = re.compile(varRegEx, re.VERBOSE).sub(r'\1%s'%valStr.replace('\\', '\\\\'), cmdFileContent)