正则表达式帮助python找到链接

Question

我正在从html页面解析一些链接，我想检测所有符合以下模式的链接：

http://www.example.com/category1/some-content-here/
http://www.example.com/category-12/some-content-here/

它不应该匹配以下链接：

http://www.example.com/category1/
http://www.example.org/category-12/some-content-here/

谢谢！

Answer 1

您可以使用BeautifulSoup来解析HTML a标记，然后使用正则表达式来过滤原始的完整结果：

from bs4 import BeautifulSoup as soup
import re
sample = """
<div id='test'>
    <a href='http://www.example.com/category1/some-content-here/'>Someting</a>
    <a href='http://www.example.com/category-12/some-content-here/'>Someting Here</a>
    <a href='http://www.example.com/category1/'>Someting1</a>
    <a href='http://www.example.org/category-12/some-content-here/'>Sometingelse</a>
 </div>
 """
a = [i['href'] for i in soup(sample, 'lxml').find_all('a') if re.findall('http://[\w\.]+\.com/[\w\-]+/[\w\-]+/', i['href'])]

输出：

['http://www.example.com/category1/some-content-here/', 'http://www.example.com/category-12/some-content-here/']