正则表达式对于解析HTML是个坏主意。读取并依赖格式正确的HTML是很神秘的。
尝试使用BeautifulSoup forPython。这是一个示例脚本，该脚本从site：domain.com Google查询的前10个页面返回URL。
import sys # Used to add the BeautifulSoup folder the import path
import urllib2 # Used to read the html document
if __name__ == "__main__":
### Import Beautiful Soup
### Here, I have the BeautifulSoup folder in the level of this Python script
### So I need to tell Python where to look.
sys.path.append("./BeautifulSoup")
from BeautifulSoup import BeautifulSoup
### Create opener with Google-friendly user agent
opener = urllib2.build_opener()
opener.addheaders = [('User-agent', 'Mozilla/5.0')]
### Open page & generate soup
### the "start" variable will be used to iterate through 10 pages.
for start in range(0,10):
url = "http://www.google.com/search?q=site:stackoverflow.com&start=" + str(start*10)
page = opener.open(url)
soup = BeautifulSoup(page)
### Parse and find
### Looks like google contains URLs in <cite> tags.
### So for each cite tag on each page (10), print its contents (url)
for cite in soup.findAll('cite'):
print cite.text
输出：
stackoverflow.com/
stackoverflow.com/questions
stackoverflow.com/unanswered
stackoverflow.com/users
Meta.stackoverflow.com/
blog.stackoverflow.com/
chat.Meta.stackoverflow.com/
...
当然，您可以将每个结果附加到列表中，以便可以将其解析为子域。我几天前刚接触Python并抓取内容，但这应该可以帮助您入门。
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