比如 输入 3334 或4333 3433 3343 如何识别成功呢？

# -*- coding: UTF-8 -*-

import re
l = ['1111', '1234', '1223', '1112', '6665', 'aaab', '111113', '11115', '11211', '1122', '2211', '1222', '9998']
pattern = r'^(\d)\1{2}(?!\1)\d$' #如果不限定为数字，可以把\d换成\w
for s in l:
    ret = re.search(pattern, s)
    if ret:
        print(s)

1112
6665
9998

问题解决的话，请点下采纳