python 如何实现PHP替换图片 链接

Question

def replace_real_url(html, curr_url):
    """
    将 html 中的相对路径替换为 绝对路径
    :param html:
    :param curr_url:
    :return:
    """
    if html and curr_url:
        pattern = ur'<([a-z]{1,5})[^><]*(href|src)=["\']{0,1}([^"\']+)["\']{0,1}[^><]*>'
        html = re.sub(pattern, lambda x: replace_real_url_callback(x, curr_url), unicode(html), re.I | re.M)
    return html
 
 
def replace_real_url_callback(repl, curr_url):
    """
    执行替换
    :param repl:
    :param curr_url:
    :return:
    """
    ret = repl.group()
    if repl and repl.lastindex == 3 and repl.group(1).lower() in ['a', 'img']:
        url = urljoin(curr_url, repl.group(3))
        ret = re.sub(ur'' + re.escape(repl.group(3)), unicode(url), ret)
    return ret

如何修正这个替换的方法。

Answer 1

print re.sub('(<img src=")(.+?)(" />)', r'\1aa\3', 'aa<img src="/aaa.jpg" />bb')

#   aa<img src="aa" />bb