Nit: the "8945" in your last code block, "the output...6 digits number" doesn't seem to bear any direct relationship to the data sample you provided. It's not crucial to our understanding -- in this case! -- but generally, you do need to be careful to cut and paste accurately to avoid sending us off on wild goose chases.

More substantially, the regex, $test=~s/\([\d.+]|[\d.+]\)//g often won't do what you appear to expect, as (ignoring the attempt to match parentheses) it matches any digit, followed by one_or_more of anything (digit or not). For help on that -- in other words, to see why you got two sets of two digits -- reread about quantifiers.

And, my suggestion would be that you'll learn more by doing so before reading the below: