尋找正則表達式來轉義特殊字符集

Question

目標是用\\_和\\*分別替換在 Markdown 中具有特殊作用的字符串中的字符，例如_和* 。

我當前的方法如下所示：

text = "Text *here* should be _formatted_"
specials = ["*", "_"]
for char in specials:
    text = text.replace(char, f"\\{char}")

想知道是否有其他方法可以使用正則表達式實現此功能。

Answer 1

可以在 re.sub() function 中使用它來轉義特殊字符
還沒有逃脫。

r"(?<?\\)((::\\\\)*)([*_])"

https://regex101.com/r/8LNp5E/1

示例 Python

>>> import re
>>> target = (
...    r"The goal is to replace characters in string such as _ and * in that have" + "\n"
...    r"special role in Markdown \\_ and \\*  and  \_ and \* ." + "\n"
...   )
>>>
>>> res = re.sub( r"(?<!\\)((?:\\\\)*)([*_])", r"\1\\\2", target )
>>>
>>> print ( res )
The goal is to replace characters in string such as \_ and \* in that have
special role in Markdown \\\_ and \\\*  and  \_ and \* .