结合|，实现多邮箱匹配
import re
"""
匹配出163邮箱，且@符号之前有4-20位英文字母数字或下划线
"""
email1 = "hello@qq.com"
email2 = "hello@163.com"
email3 = "hello@123.com"
ret = re.match("^[a-zA-Z0-9_]{4,20}@(163|123|qq)\.com$", email1)
if ret:
print("正确，", ret.group())
else:
print("不正确")
取分组内的匹配到的值
ret = re.match("^[a-zA-Z0-9_]{4,20}@(163|123|qq)\.com$", "1377302230@qq.com")
print(ret.group(1))
html标签一致匹配
ret = re.match(r'<([a-zA-Z]*)>.*</\1>', '<html>hello beauty</html>')
print(ret.group())
ret = re.match(r'<(?P<p1>[a-zA-Z]*)>.*</(?P=p1)>', '<html>hello beauty</html>')
print(ret.group())
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