利用python的正则表达式从超链接取数

Question

在爬图片网站的图片，要把"src="后面的链接取出来，但是一直取出来是空的，不知道正则表达式哪里有错！

要爬取的链接：

想要得到的结果：
//img.ivsky.com/img/tupian/li/202107/15/xingkong-005.jpg

目前的正则写法：

ex = '

.*?<img src="(.*?)" alt.*?

'
img_src_list = re.findall(ex,page_text,re.S)

完整的代码：

import requests
import re
import os
if __name__ == "__main__":
    if not os.path.exists('./otherLibs'):
        os.mkdir('./otherLibs')
    url = 'https://www.ivsky.com/tupian/ziranfengguang/'
    headers = {
        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0'
    }
    page_text = requests.get(url=url,headers=headers).text
    ex = '<div class="il_img">.*?<img src="(.*?)" alt.*?</div>'
    img_src_list = re.findall(ex,page_text,re.S)
    for src in img_src_list:
        src = 'https:'+src
        iamge_data = requests.get(url=url,headers=headers).content
        img_name = src.split('/')[-1]
        img_Path= './otherLibs'+img_name
        with open(img_Path,'wb') as fp:
            fp.write(iamge_data)
            print(img_name,'下载成功')

Answer 1

望被采纳

import os
import re
import requests
if __name__ == "__main__":
    if not os.path.exists('./otherLibs'):
        os.mkdir('./otherLibs')
    url = 'https://www.ivsky.com/tupian/ziranfengguang/'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36',
        'cookie': 't = 15dc3f49950b911ad395e4d2b5f21bd0;r = 9777;Hm_lvt_a0c29956538209f8d51a5eede55c74f9 = 1642561701;'
                  'Hm_lpvt_c13cf8e9faf62071ac13fd4eafaf1acf = 1642561835;Hm_lpvt_a0c29956538209f8d51a5eede55c74f9 = 1642561836'
    }
    # 必须要加cookie  ，可以在浏览器登录后获取，或这接口请求再提取cookie
    page_text = requests.get(url=url, headers=headers).text
    ex = '<img src="(.*?)" alt="(.*?)">'  
    img_src_list = re.findall(ex,page_text)  #找出src 和alt  返回元组

    for src in img_src_list:
        url = 'https:' + src[0]   #拼接图片地址
        alt=src[1]                #获取alt 标题
        if not os.path.exists('./otherLibs/{}'.format(alt)):
            os.mkdir('./otherLibs/{}'.format(alt))    #创建以标题为名的文件夹
        with open("./otherLibs/{}/{}.txt".format(alt,alt), 'w+') as fp:     #打开或创建以标题为名的 文件
            fp.write(alt+"-->"+url)     #向文件中写入src
            print(alt, '下载成功')

生成的文件和下载地址

望被采纳