想获取html中time用python正则如何实现

想做一个爬虫，使用BeautifulSoup假使获取以下内容：

<div class="authi">
<img class="authicn vm" id="" src="static/image/common/online_member.gif" />
<em id="">发表于 <span title="2013-4-2 08:30:11">4&nbsp;天前</span></em>
<span class="pipe">|</span><a href=>倒序浏览</a>
<div style="float:right;position:relative;top:-6px;"><ul>
<li style="float: left; width: 130px; height: 24px;"><wb:follow-button uid="" type="gray_2" width="136" height="24"></wb:follow-button></li>
<li style=" float:left; width: 160px; height: 24px;"></li>
</ul></div></div>

如何获取以上内容中的2013-4-2 08:30:11这个时间呢？
我试着写了一个

re.compile('^20\d{2}-\d+-\d+\s\d{2}:\d{2}:\d{2}')

可是这个在使用的时候不能匹配到时间？如何解决？谢谢！

re.compile('20\d{2}-\d+-\d+\s\d{2}:\d{2}:\d{2}')
https://gist.github.com/greatghoul/53...
# -*- coding: utf-8 -*- from BeautifulSoup import BeautifulSoup import re def get_timestamp(html): soup = BeautifulSoup(html) authi_elems = soup.findAll('div', { 'class': 'authi' }) for authi_elem in authi_elems: date_elem = authi_elem.find('span', title=re.compile(r'20\d{2}-\d+-\d+\s\d{2}:\d{2}:\d{2}')) print date_elem.get('title') if __name__ == '__main__': html = """ <div class="authi"> <img class="authicn vm" id="" src="static/image/common/online_member.gif" /> <em id="">发表于 <span title="2013-4-2 08:30:11">4 天前</span></em> <span class="pipe">|</span><a href=>倒序浏览</a> <div style="float:right;position:relative;top:-6px;"><ul> <li style="float: left; width: 130px; height: 24px;"><wb:follow-button uid="" type="gray_2" width="136" height="24"></wb:follow-button></li> <li style=" float:left; width: 160px; height: 24px;"></li> </ul></div></div> """ get_timestamp(html)

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