正则表达式问题

Mikil

s ='<a href="//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=50" class=" pagination-item " >2</a>'
现在有一个字符串
我想爬取
//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=50
2
应该怎么写正则表达式呢

Mikil

<a.href="(.*?)".class=".pagination-item.".>\d</a>

我是这样的，为什么不正确呢

zltzlt

这样可以：

1. >>> import re
   
2. >>> import requests as r
   
3. >>> re.findall('<a.href="(.*?)".class=".pagination-item.".>', r.get("https://tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=50&traceid=").text)
   
4. ['//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=0', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=100', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=150', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=200', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=250', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=300', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=350', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=400', '//tieba.baidu.com/f?kw=%E5%A5%B3%E7%A5%9E&ie=utf-8&pn=450']

复制代码

zltzlt

1. '<a.href="(.*?)".class=".pagination-item.".>'

复制代码