多个标签的Python正则表达式 [英] Python regular expression for multiple tags

问题描述

我想知道如何检索每个< p> 标记的所有结果。

I would like to know how to retrieve all results from each <p> tag.

import re
htmlText = '<p data="5" size="4">item1</p><p size="4">item2</p><p size="4">item3</p>'
print re.match('<p[^>]*size="[0-9]">(.*?)</p>', htmlText).groups()

result：

('item1', )

我需要：

what I need:

('item1', 'item2', 'item3')

推荐答案

正则表达式的答案非常脆弱。这里是证明（和BeautifulSoup的一个例子）。

The regex answer is extremely fragile. Here's proof (and a working BeautifulSoup example).

from BeautifulSoup import BeautifulSoup

# Here's your HTML
html = '<p data="5" size="4">item1</p><p size="4">item2</p><p size="4">item3</p>'

# Here's some simple HTML that breaks your accepted 
# answer, but doesn't break BeautifulSoup.
# For each example, the regex will ignore the first <p> tag.
html2 = '<p size="4" data="5">item1</p><p size="4">item2</p><p size="4">item3</p>'
html3 = '<p data="5" size="4" >item1</p><p size="4">item2</p><p size="4">item3</p>'
html4 = '<p data="5" size="12">item1</p><p size="4">item2</p><p size="4">item3</p>'

# This BeautifulSoup code works for all the examples.
paragraphs = BeautifulSoup(html).findAll('p')
items = [''.join(p.findAll(text=True)) for p in paragraphs]

使用BeautifulSoup。

Use BeautifulSoup.

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