从 HTML 中删除标签，特定标签除外（但保留其内容）

Question

我使用此代码删除 HTML 中的所有标记元素。我需要保留   和   。所以我使用这个代码：

import re
MyString = 'aaa<p>Radio and<BR> television.<br></p><p>very<br/> popular in the world today.</p><p>Millions of people watch TV. </p><p>That’s because a radio is very small <span_style=":_black;">98.2%</span></p><p>and it‘s easy to carry. <span_style=":_black;">haha100%</span></p>bb'
MyString = re.sub('(?i)(<br\/?>)|<[^>]*>',r'', MyString)
print(MyString)

输出为：

aaaRadio and<BR> television.<br>very<br/> popular in the world today.Millions of people watch TV. That’s because a radio is very small 98.2%and it‘s easy to carry. haha100%bb

结果是对的，但是现在我想保留 and  and   and   .

如何修改我的代码？

Answer 1

我不确定 regex 是这里的正确解决方案，但既然你问了：

import re
html = html.replace("<p>", "{p}").replace("</p>", "{/p}")
txt = re.sub("<[^>]*>", "", html)
txt = txt.replace("{p}", "<p>").replace("{/p}", "</p>")

我基本上将 p 标签更改为另一个标记，并在删除所有标签后替换回去。

用正则表达式解析 html，通常不是一个好主意。

Answer 2

使用 HTML 解析器比使用正则表达式更可靠。正则表达式不应用于解析嵌套结构，如 HTML.

这是一个有效的实现，它遍历所有 HTML 标签，对于那些不是 p 或 br 的标签，删除它们的标签：

from bs4 import BeautifulSoup

mystring = 'aaa<p>Radio and<BR> television.<br></p><p>very<br/> popular in the world today.</p><p>Millions of people watch TV. </p><p>That’s because a radio is very small <span_style=":_black;">98.2%</span></p><p>and it‘s easy to carry. <span_style=":_black;">haha100%</span></p>bb'

soup = BeautifulSoup(mystring,'html.parser')
for e in soup.find_all():
    if e.name not in ['p','br']:
        e.unwrap()
print(soup)

输出：

aaa<p>Radio and<br/> television.<br/></p><p>very<br> popular in the world today.</br></p><p>Millions of people watch TV. </p><p>That’s because a radio is very small 98.2%</p><p>and it‘s easy to carry. haha100%</p>bb

Answer 3

现在我知道如何 modify.But 第一个  不见了。

我的代码：

import re
MyString = 'aaa<p>Radio and<BR> television.<br></p><p>very<br/> popular in the world today.</p><p>Millions of people watch TV. </p><p>That’s because a radio is very small <span_style=":_black;">98.2%</span></p><p>and it‘s easy to carry. <span_style=":_black;">haha100%</span></p>bb'
# MyString = re.sub('(?i)(<br\/?>)|<[^>]*>',r'', MyString)
MyString = re.sub('(?i)(<br\/?>)|<[^>]*>(<\/?p>)|<[^>]*>',r'', MyString)
print(MyString)

输出为：

aaaRadio and<BR> television.<br><p>very<br/> popular in the world today.<p>Millions of people watch TV. <p>That’s because a radio is very small 98.2%</p>and it‘s easy to carry. haha100%</p>bb

从 HTML 中删除标签，特定标签除外（但保留其内容）

Removing tags from HTML, except specific ones (but keep their contents)

python

regex

parsing

html-parsing

python-3.x