如何搜索在python

Question

我使用python3.5.1和BeautifulSoup 我想用正则表达式来搜索特定链路刮网站使用正则表达式的特定链接： 我的代码：

from bs4 import BeautifulSoup 
import urllib.request 
import re 
r = urllib.request.urlopen('http://i.cantonfair.org.cn/en/expexhibitorlist.aspx?categoryno=404').read() 
soup = BeautifulSoup(r,"html.parser") 
links = soup.find_all("a", href=re.compile(r"ExpExhibitorList\.aspx\?categoryno=[0-9]+"))  
linksfromcategories = ([link["href"] for link in links]) 
print(linksfromcategories) 

我得到所有的类似链接

['/cn/ExpExhibitorList.aspx?categoryno=432', 'ExpExhibitorList.aspx?categoryno=432003'] 

但我不想

'/cn/ExpExhibitorList.aspx?categoryno=432' 

待检索

Answer 1

只需在您的正则表达式中使用锚。

links = soup.find_all("a", href=re.compile(r"^ExpExhibitorList\.aspx\?categoryno=[0-9]+$")) 

这将符合所有a标签，其具有由上述正则表达式匹配的精确值。