python - 在 python 中编写正则表达式

Question

我不擅长编写正则表达式，所以我需要一些帮助。我需要一个匹配 section 7.01 和 (a)

的正则表达式

基本上 section 后面可以跟任何数字，例如 6.1/7.1/2.1

例子:

SECTION 7.01. Events of Default. If any of the following events
("Events of Default") shall occur:
          (a) any Borrower shall fail to pay any principal of any Loan when and
     as the same shall become due and payable, whether at the due date thereof
     or at a date fixed for prepayment thereof or otherwise;

我正在尝试编写一个正则表达式，它可以给我包含这些的组

第 1 组

SECTION 7.01. Events of Default. If any of the following events
("Events of Default") shall occur:

第 2 组

(a) any Borrower shall fail to pay any principal of any Loan when and
     as the same shall become due and payable, whether at the due date thereof
     or at a date fixed for prepayment thereof or otherwise;

在(a)之后还可以有更多的点，比如b等。

请帮我写一个正则表达式。

Answer 1

您可以使用以下方法，但是，要进行多个假设。节标题必须以 SECTION 开头，以冒号 : 结尾。其次，小节必须以匹配的括号'开始，并以分号结束。

import re
def extract_groups(s):
    sanitized_string = ''.join(line.strip() for line in s.split('\n'))
    sections = re.findall(r'SECTION.*?:', sanitized_string)
    sub_sections = re.findall(r'\([a-z]\).*?;', sanitized_string)
    return sections, sub_sections

示例输出:

>>> s = """SECTION 7.01. Events of Default. If any of the following events
("Events of Default") shall occur:
          (a) Whether at the due date thereof
     or at a date fixed for prepayment thereof or otherwise;

          (b) Test;
SECTION 7.02. Second section:"""
>>> print extract_groups(s)
(['SECTION 7.01. Events of Default. If any of the following events("Events of Default") shall occur:', 'SECTION 7.02. Second section:'], 
['(a) Whether at the due date thereofor at a date fixed for prepayment thereof or otherwise;', '(b) Test;'])