正则表达式返回结果为空列表，请问怎么解决？

请问我这段代码哪里错了，使用正则表达式返回的结果为空列表，怎么回事
import requests

import re
headers = {"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36"}
url = "http://www.aiimg.com/"
res = requests.get(url=url,headers=headers)
response = res.content.decode('gb2312')
print(response)
img_url = re.findall(r'img\ssrc="(.*?)"',response,re.M)
print(img_url)
for photos in img_url:
print(photos)
photo_response = requests.get(url=photos,headers=headers).content.decode('gb2312')
for photo in photo_response:
for numbers in range(1,len(img_url)):
with open("imgs_"+str(numbers)+".jpg","wb") as fp:
fp.write(photo_response)
print("OK")

我的解答思路和尝试过的方法
爬取http://www.aiimg.com/上的图片


import requests
import re

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36"}
url = "http://www.aiimg.com/"
res = requests.get(url=url,headers=headers)
response = res.content.decode('gb2312')

img_url = re.findall(r'<img[^>]+src=[\'"](http://[^\'"]+)[\'"]+', response, re.M)

#print('get image urls:')
print(img_url)
numbers = 1
for photos in img_url:
    print(photos)
    photo_response = requests.get(url=photos,headers=headers).content
    with open("imgs_"+str(numbers)+".jpg","wb") as fp:
        fp.write(photo_response)
    numbers += 1

正则没写对，将s改成.*?即可

img

正则表达式的正确写法应该是，因为img和src之间并不一定是单个空白符，所以需要加上.*?，由于这里也有可能是换行符，所以最后加上re.DOTALL从而表示.(点)也可以用来表示换行符：

img_url = re.findall(r'img.*?src="(.*?)"',response, re.DOTALL)

img