[Solved] REGEX with two capturing groups

You can use this regex:

<result1>(.*?)<result1>(?:(?:.(?!<result1>))*?<result>(.*?)<result>)?

Can get your text in group #1 and group #2 (if exists). This regex will give:

MATCH 1
1.  `A1`
2.  `B1`

MATCH 2
1.  `A2`

MATCH 3
1.  `A3`
2.  `B3`

RegEx Demo