python - 使用正则表达式删除 <a> 并仅从具有特定语言的 html 行返回其文本

Question

我正在尝试删除 <a>包含特定句子的行标签如下:

text before line im interested in which may include <a> tag </a>
Go to <a href="#step2"> Step 2</a>
text after line im intrested in which may also include <a> tag </a>

到目前为止我想到的是:

(?!(Go to|Return to|Continue to)( )?)(<a(.*)?>(?!(( )?Step \d( )?))(.*)?<\/a>)|(<a.*(Go to|Return to|Continue to).*\/a>)

但这似乎并不能满足我的需要:-( <a> tag </a>

期望的结果:Go to Step 2

我错过了什么？

Answer 1

我的猜测是，也许这个表达方式可能与您的想法很接近，但不确定。

使用re.findall进行测试

import re

regex = r"(go\s+to|return\s+to|continue\s+to)\s*<a\s+(?:[^>]+?)>([^<]+?)\s*</a>"

test_str = ("text before line im interested in which may include <a> tag </a>\n"
    "Go to <a href=\"#step2\"> Step 2</a>\n"
    "Return to <a href=\"#step2\"> Step 20 </a>\n"
    "CONTINUE To      <a href=\"#step2\"> Step 20   </a>\n"
    "text after line im intrested in which may also include <a> tag </a>")

matches = re.findall(regex, test_str, re.IGNORECASE)

for match in matches:
    print(match[0]+match[1])

输出

Go to Step 2
Return to Step 20
CONTINUE To Step 20

该表达式在 this demo 的右上角面板中进行了解释如果您想探索/简化/修改它。