如何在Python中转义所有未转义的斜杠

Question

我在Python中有一个部分转义路径，如下所示：

path = "C:\\Temp\\\\TestEmpty" # Actual value = C:\Temp\\TestEmpty

我希望所有的斜杠都是这样的：

^{pr2}$

我从一些正则表达式开始

escapedpath = re.sub("[a-zA-Z0-9 _:-](\\)[a-zA-Z0-9 _:-]", "\\\\", path)

…但这当然会删除\\s前后的字符

这怎么可能？在

Answer 1

result = re.sub(r"""(?x)
    (?<!\\)     # Make sure that there is no backslash before the current position
    \\          # Match a backslash
    (?=         # only if...
     (?:\\\\)*  # an even number of backslashes follows (including zero)
     (?!\\)     # and no further backslashes follow after that
    )           # (End of lookahead assertion)""", 
    r"\\\\", subject)

仅当此处的连续反斜杠数为奇数时才替换反斜杠。在