跳過我正在尋找的模式中包含的正則表達式模式

Question

我正在解析包含以^[開頭並以]結尾的腳注的 Pandoc-markdown 文件，其中一些包含嵌入的[] 。 例如：

...
to explain how the feature came to be as it is, so you can use generics more
effectively.^[Angelika Langer's [Java Generics FAQ](
www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html) as well as her other
writings (together with Klaus Kreft) were invaluable during the preparation of
this chapter.]
...

（在 Python 中）的簡單方法：

re.compile(r"\^\[.+?\]", flags=re.DOTALL)

在第一個]處停止，因此不會捕獲整個腳注。 有沒有辦法傳遞嵌套的[]子句？

Answer 1

您可以使用 PyPi 正則表達式模塊使用子程序來做到這一點，您只需要在設置組邊界時小心：

import regex
text = r"""...
to explain how the feature came to be as it is, so you can use generics more
effectively.^[Angelika Langer's [Java Generics FAQ](
www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html) as well as her other
writings (together with Klaus Kreft) were invaluable during the preparation of
this chapter.]
..."""
print( [x.group(1) for x in regex.finditer(r'\^(\[(?:[^][]++|(?1))*])', text)] )

輸出：

["[Angelika Langer's [Java Generics FAQ](\nwww.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html) as well as her other\nwritings (together with Klaus Kreft) were invaluable during the preparation of\nthis chapter.]"]

請參閱Python 演示和正則表達式演示。 細節：

• \\^ - ^字符
• (\\[(?:[^][]++|(?1))*]) - 第 1 組：
  • \\[ - 一個[字符
  • (?:[^][]++|(?1))* - 0 次或多次出現：
    • [^][]++ - 除]和[之外的一個或多個字符
    • | - 或者
    • (?1) - 第 1 組模式
• ] - 一個]字符。