from the original discussion on Reddit:

Okay but I also just want a list of each of the matches so I can parse them separately. Think attributes in html, a tag can have multiple, and being able to handle each individually is useful

...

that still doesn't give me

(a => [1, 2, 3], b => [4, 5, 6]) where in my analogy the letters are the html tags and the numbers are the attributes

your answer with "1 2 3" in a string has already been given multiple times.

BTW: The OP's moniker is Timegazer not Onion