re.match ??

??:

re.match(pattern, string, flags=0)

re.match? ???? ?? ???? ?? ??? ?????. ?? ???? ??? ???? match()? ??? ?????.

re.search ??

??:

re.search(pattern, string, flags=0)

re.search? ?? ???? ???? ? ??? ??? ?? ??? ?????.

re.match? re.search? ????? ????? ?????. ???? ??? ??? ????.

?? ? ??? ???? ??????

re.match? ???? ?? ??? ?????. ???? ?? ??? ?? ???? ???? ??? ??? ???? ??? ?? ??? ?? ??? ?? ???? ??????. ??? ?? ??? ??????.

re.match? re.search? ????? ??? ???? ??? ???? ???? ??? re.findall? ???? ????

re.search? re.findall? ????? ?? ?? ???. ???? ???? ????. ?? ???. ????? ??? ???? ?? ??? ??????.

?:

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
# 提取圖片的地址
import re
a = '<img src="https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg">'
# 使用 re.search
search = re.search('<img src="(.*)">', a)
# group(0) 是一個完整的分組
print(search.group(0))
print(search.group(1))
# 使用 re.findall
findall = re.findall('<img src="(.*)">', a)
print(findall)
# 多個分組的使用（比如我們需要提取 img 字段和圖片地址字段）
re_search = re.search('<(.*) src="(.*)">', a)
# 打印 img
print(re_search.group(1))
# 打印圖片地址
print(re_search.group(2))
# 打印 img 和圖片地址，以元祖的形式
print(re_search.group(1, 2))
# 或者使用 groups
print(re_search.groups())

?? ??:

<img src="https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg">
https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg
['https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg']
img
https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg
('img', 'https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg')
('img', 'https://s-media-cache-ak0.pinimg.com/originals/a8/c4/9e/a8c49ef606e0e1f3ee39a7b219b5c05e.jpg')

????? ???? ?? ??? ???? ????? ?? ???? ??? ? ?? ??? ???? ? ??? ? ????. ?? ??? ???? ???? ???? ??? ? ????. Python?? ??? ??? ??? ?? ???? ??? ? ??? ?? ?? ???? ??????. ??? ???? Python? ???? ? ?? ?????. ????? Python?? ???? ? ?? ???? ???? ??? ?? ?? ? ?? ??? ?? ?????.