Is there a variable containing all tokens that matched a regex search term?

If I enter a regex search term, all occurrences of the matched items
in a window will be highlighted.

Is there a way to create a new window and populate it with only the
found items?

OR is there a variable that contains all items matching the regex
search term?

Example:

A colleague is working on a some large files where we use substitution
variables than start with '&&'. Assume these are terminated by white
space, so are 'words' to vim.

He would like to extract just the tokens that start with '&&' and
populate a new window with those, so he can pull the tokens from two
separate files and see if all that occur in one occur in the other.

I was stumped at how to get this done.

Thanks!

Tom P.

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