BeautifulSoup提取

Question

我有一個「問題」與BeautifulSoup，更尤其是重模塊 這裏的問題是：

import re 

from bs4 import BeautifulSoup 

string = """ 
<div id="my_id"> 
    <ul> 
     <li>something</li> 
     <li class="color12">something</li> 
     <li class="color45">something else</li> 
    </ul> 
</div> 
""" 
soup = BeautifulSoup(string) 
li = soup.find_all('li', {'class': re.compile('color(\d+)')}) 
for ele in li: 
    print ele['class'] # will print colorXXXX but i would like to know how to get only this XXXX 

，但我想顏色之後，只提取數量。是否有可能還是我必須使用類似的義務：

match = re.search(r'color(\d+)', str(ele['class'])) 
if match: 
    print match.group(1) 

謝謝你的幫助:)

Answer 1

你必須重新申請正則表達式。只要將其存儲在變量和重用：

colorpattern = re.compile(r'color(\d+)') 

li = soup.find_all('li', {'class': colorpattern}) 
for ele in li: 
    print colorpattern.search(ele['class']).group(1)