字符串搜索使用正则表达式

import re

text = "Hello, World! This is a test string. Hello, Python!"
pattern = r"Hello, \w+"

matches = re.findall(pattern, text)
print(matches)

['Hello, World!', 'Hello, Python!']

import re

text = "Please contact us at info@example.com for more information. Also, you can reach us at support@example.org"
pattern = r"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}"

matches = re.findall(pattern, text)
print(matches)

['info@example.com', 'support@example.org']