Every group to be captured has to have its own explicit set of parentheses in the regex. You can't populate $2, $3, $4, and $5 by putting a quantifier after the 2nd group.

So you'll probably want to do this in two steps. I'll pretend you have a $float regex and a $non_num regex:

($text, $nums) = /(text);((?:$float$non_num){4})/;
@nums = split $non_num, $nums;
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