[CMake] Capturing matches in regex groups

[Robert Dailey]

I haven't really seen a way to get a list of group matches in a regex. For
example, string( REGEX MATCH ) only returns the whole string matched, not
just what was in the capture groups. If I do this:

(\\w+)\\,(\\w+)\\,(\\w+)

and I match that regex against this string:

hello,world,today

I should get a list with:

hello;world;today

How can I do this?

---------
Robert Dailey
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