使用正则表达式查找所有出现的交替数字。

I would like to find all alternating digits in a string using regular expressions. An alternating digit is defined as two equal digits having a digit in between; for example, 1212 contains 2 alternations (121 and 212) and 1111 contains 2 alternations as well (111 and 111). I have the following regular expression code:I would like to find all alternating digits in