如何用正则表达式匹配形如ABAB或者AABB的字符串
AABB: /([a-z])\1(?!\1)([a-z])\2/iABAB: /([a-z])(?!\1)([a-z])\1\2/i
正则
2020-01-19 PM
AABB: /([a-z])\1(?!\1)([a-z])\2/iABAB: /([a-z])(?!\1)([a-z])\1\2/i