Python:使用正则表达式在某些网站标签之间查找句子 [英] Python: Find a Sentence between some website-tags using regex

问题描述

我想在 ...class="question-hyperlink"> 标签之间找到一个句子.使用此代码:

I want to find a sentence between the ...class="question-hyperlink"> tags. With this code:

import urllib2
import re

response = urllib2.urlopen('https://stackoverflow.com/questions/tagged/python')
html = response.read(20000)

a = re.search('question-hyperlink', html)
print html[a.end()+3:a.end()+100]

我明白了:

DF5 for Python: high level vs low level interfaces. h5py</a></h3>        <div class="excerpt">

如何在下一个 < 处停止?我如何找到下一个句子?我想用正则表达式来做.

How can I stop at the next < ? And how do I find the next sentence? I want to do it with regex.

编辑致反对者:我想像他那样做:正则表达式匹配除 XHTML 自包含标签之外的开放标签

EDIT To the downvoters: I want to do it like he does: RegEx match open tags except XHTML self-contained tags

推荐答案

如果你必须用正则表达式来做，试试这样的:

If you must do it with regular expressions, try something like this:

a = re.finditer('<a.+?question-hyperlink">(.+?)</a>', html)
for m in a: 
    print m.group(1)

仅供参考，此代码执行相同的操作，但方式更加健壮:

Just for the reference, this code does the same, but in a far more robust way:

doc = BeautifulSoup(html)
for a in doc.findAll('a', 'question-hyperlink'):
    print a.text

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