如何使用正则表达式解析HTML标签? [英] How do I use regular expressions to parse HTML tags?

问题描述

想知道如何使用正则表达式(最好在python中)推断html元素的值.

Was wondering how I would extrapolate the value of an html element using a regular expression (in python preferably).

例如，<a href="http://google.com"> Hello World! </a>

我将使用什么正则表达式从上面的html中提取Hello World!?

What regex would I use to extract Hello World! from the above html?

推荐答案

但是 BeautifulSoup 是一个方便的库

But BeautifulSoup is a handy library.

>>> from BeautifulSoup import BeautifulSoup
>>> html = '<a href="http://google.com"> Hello World! </a>'
>>> soup = BeautifulSoup(html)
>>> soup.a.string
u' Hello World! '

---

例如，这将在此页面上打印出链接:

---

This, for instance, would print out links on this page:

import urllib2
from BeautifulSoup import BeautifulSoup

q = urllib2.urlopen('https://stackoverflow.com/questions/3884419/')
soup = BeautifulSoup(q.read())

for link in soup.findAll('a'):
    if link.has_key('href'):
        print str(link.string) + " -> " + link['href']
    elif link.has_key('id'):
        print "ID: " + link['id']
    else:
        print "???"

输出:

Stack Exchange -> http://stackexchange.com
log in -> /users/login?returnurl=%2fquestions%2f3884419%2f
careers -> http://careers.stackoverflow.com
meta -> http://meta.stackoverflow.com
...
ID: flag-post-3884419
None -> /posts/3884419/revisions
...

这篇关于如何使用正则表达式解析HTML标签?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！