两个符号之间的Strike-Down Markdown文本

Question

我试图在python中模仿来自GitHub的击穿标记，我设法完成了一半的工作。现在我只有一个问题：我正在使用的模式似乎没有替换包含符号的文本，我无法弄明白所以我希望有人可以帮助我

    text = "This is a ~~test?~~"
    match = re.findall(r"(?<![.+?])(~{2})(?!~~)(.+?)(?<!~~)\1(?![.+?])", text) # Finds all the text between ~~ symbols
    if match:
        for _, m in match: # Iterates though the matches. First variable (_) containing the symbol ~ and the second one (m) contains the text I want to replace
            text = re.sub(f"~~{m}~~", "\u0336".join(m) + "\u0336", text) # Should replace ~~test?~~ with t̶e̶s̶t̶?̶ but it fails

Answer 1

您要替换的字符串中存在问题。在你的情况下，~~{m}~~，其中m的值是test?，要替换的正则表达式变成~~test?~~，这里?有一个特殊的含义，你没有逃避，因此替换不能正常工作。只是尝试使用re.escape(m)而不是m，因此元字符被转义并被视为文字。

试试你修改过的Python代码，

import re

text = "This is a ~~test?~~"
match = re.findall(r"(?<![.+?])(~{2})(?!~~)(.+?)(?<!~~)\1(?![.+?])", text) # Finds all the text between ~~ symbols
if match:
 for _, m in match: # Iterates though the matches. First variable (_) containing the symbol ~ and the second one (m) contains the text I want to replace
  print(m)
  text = re.sub(f"~~{re.escape(m)}~~", "\u0336".join(m) + "\u0336", text) # Should replace ~~test?~~ with t̶e̶s̶t̶?̶ but it fails
  print(text)

这取代了你想象和打印，

This is a t̶e̶s̶t̶?̶