如何提取文件中两个指定标记字符串之间的特定范围文本？

方案1：字符串分割法（最简单，不易出错，无需掌握正则规则） #

直接用两个固定标识做两次分割即可，逻辑清晰不容易踩坑：

• 第一步：用前标识Overall interfering behavior data trends are as followed:对原始文本做分割，取分割后的第二部分（即前标识之后的所有内容）
• 第二步：对上一步得到的内容，用后标识Observations of Client's response to skill acquisition:做分割，取分割后的第一部分，就是目标提取内容
• 最后对提取到的内容做首尾去空白处理即可

Python实现示例代码：

# 此处替换为你的原始文本内容
raw_text = """Observations of Client Behavior: Overall interfering behavior data trends are as followed: THIS IS THE DESIRED TEXT. Observations of Client's response to skill acquisition: Overall skill acquisition data trends ...."""
# 定义前后分割标识
start_flag = "Overall interfering behavior data trends are as followed:"
end_flag = "Observations of Client's response to skill acquisition:"

# 两次分割提取目标内容
target_content = raw_text.split(start_flag)[1].split(end_flag)[0].strip()

# 写入独立文本文件
with open("提取的行为观察内容.txt", "w", encoding="utf-8") as f:
    f.write(target_content)

方案2：正则匹配法（适合批量处理多段匹配的场景） #

之前正则匹配失败大概率是没有开启单行匹配模式，默认正则的.不匹配换行符，如果文本包含换行就会匹配中断。正确的正则规则需要开启DOTALL模式，匹配规则为(?<=Overall interfering behavior data trends are as followed:).*?(?=Observations of Client's response to skill acquisition:)

• (?<=xxx)是正向后顾断言，匹配xxx后面的位置
• .*?是非贪婪匹配所有字符，避免多段匹配时超出范围
• (?=xxx)是正向前瞻断言，匹配xxx前面的位置

Python实现示例代码：

import re

# 此处替换为你的原始文本内容
raw_text = """Observations of Client Behavior: Overall interfering behavior data trends are as followed: THIS IS THE DESIRED TEXT. Observations of Client's response to skill acquisition: Overall skill acquisition data trends ...."""
pattern = r'(?<=Overall interfering behavior data trends are as followed:).*?(?=Observations of Client\'s response to skill acquisition:)'
# 开启DOTALL模式，让.可以匹配换行符
match_res = re.search(pattern, raw_text, re.DOTALL)
if match_res:
    target_content = match_res.group().strip()
    # 写入独立文本文件
    with open("提取的行为观察内容.txt", "w", encoding="utf-8") as f:
        f.write(target_content)

补充提示：如果待处理的是docx格式文档，可以先用python-docx库把文档内容读取为字符串，再按上面的逻辑处理即可。

内容的提问来源于stack exchange，提问作者SSerb1989