python读取不规则txt字段

可以使用Python的正则表达式模块re来读取不规则的txt字段。具体操作方式是，先读取整个txt文件，然后使用正则表达式来匹配需要提取的字段，最后将匹配到的内容进行处理和输出。下面是一个示例代码：

import re

# 读取txt文件
with open('example.txt', 'r') as file:
    txt = file.read()

# 使用正则表达式来匹配需要提取的字段
pattern = r'\d+\.[\w\s]+:\s(.+?)(?=\d+\.[\w\s]+:|\Z)'

fields = re.findall(pattern, txt, re.DOTALL)

# 输出提取的字段
for field in fields:
    print(field.strip())

这段代码可以提取类似这样的字段：

1. Field One: This is the content of field one.
2. Field Two:
   This is the content of field two.
   It can span multiple lines.
3. Field Three: This is the content of field three.

输出结果为：

This is the content of field one.
This is the content of field two.\nIt can span multiple lines.
This is the content of field three.