Question

我想要做的是用href =“abc / ...”替换href =“...”。除非......是http：//和https：//

我已成功完成第一部分，但我找不到检测http：//和https：//的方法，以下是代码：

line='<a href="img/a.html"/>'
print re.sub(r'href="([^<#][^"]*)"',r'href="abc/\1"', line)
//Correct Output: <a href="abc/img/a.html"/>

line='<a href="http://google.com"/>'
print re.sub(r'href="([^<#][^"]*)"',r'href="abc/\1"', line)
//WrongOutput: <a href="abc/http://google.com"/>

Answer 1

通过BeautifulSoup，

>>> import re
>>> from bs4 import BeautifulSoup
>>> s = """<a href="img/a.html"/>
<a href="http://google.com"/>"""
>>> soup = BeautifulSoup(s)
>>> for i in soup.select('a'):
        if re.match(r'(?!https?://)', i['href']):
            i['href'] = 'abc/' + i['href']


>>> print(soup)
<html><body><a href="abc/img/a.html"></a>
<a href="http://google.com"></a></body></html>

或

不，这里需要正则表达式。

>>> for i in soup.select('a'): if not i['href'].startswith('http://') or i['href'].startswith('https://'): i['href'] = 'abc/' + i['href'] >>> print(soup) <html><body><a href="abc/img/a.html"></a> <a href="http://google.com"></a></body></html>

或

>>> for i in soup.select('a'): if not i['href'].startswith(('http://', 'https://')): i['href'] = 'abc/' + i['href'] >>> soup <html><body><a href="abc/img/a.html"></a> <a href="http://google.com"></a></body></html>

Answer 2

您可以使用环顾四周

>>> line='<a href="img/a.html"/>'
>>> re.sub(r'(?<=href=")(?!https?)',r'abc/', line)
'<a href="abc/img/a.html"/>'

>>> line='<a href="http://google.com"/>'
>>> re.sub(r'(?<=href=")(?!https?)',r'abc/', line)
'<a href="http://google.com"/>'

(?<=href=")正面检查字符串位置是否由href="提出
(?!https?)负面展望未来。在href=" 不后跟http或https

Answer 3

这适用于那些可以将任务移植到HTML解析库的人（如BeautifulSoup）

import bs4

# this adds some content to create a valid doc, we'll ignore it
# since we don't need it
element = bs4.BeautifulSoup('<a href="img/a.html"/>')
print element

element.a['href'] = 'abc/' + element.a['href']
# link has changed - print element tag
print element.a

# to get the string simply cast to string
print str(element.a)
# prints: <a href="abc/img/a.html"></a>

借阅parsing HTML with regex。

替换hrefs的内容不是http和https的前缀

3 个答案: