How get a list of substrings matching a pattern?

I have succeded in writing a function which splits the contents of
a visual selection on a pattern, reverses the resulting list,
joins it together on a separator and puts the result back into the
visual selection (Yes that's kind of basic, right?):

fun! RevList(...)
let reg_save=@@
let pattern=!exists('a:1') ? '\s*,\s*' : a:1
let sep=!exists('a:2') ? ', ' : a:2
normal gvy
let @@=join(reverse(split(@@,pattern)),sep)
normal gvp
let @@=reg_save
endfun

What I want to do is to make this smart enough to not split on
commas (or whatever) which are inside quotes, so how do I extract
all substrings which match a pattern rather than split on a
pattern, the equivalent of `my @list = $string =~ m/($pattern)/g`
in Perl? (Hopefully a pattern like '\v%(%(\s*\,\s*)@!.)+' will
match the non-quoted parts...)

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