match and matchend with a negative lookbehind

I noted a strange behavior with match and matchend when I use a regex with a negative lookbehind.

p.e.
text in document:

-2 3-4-5-6-7-8

search string: \([0-9-]\@<!-\)\?\d[0-9]*
it highights -2 3 4 5 6 7 8 (as I aspected)

but when I check the match and matchend in order to copy the matches, it does include the "-" between 3-4 4-5 5-6 6-7 7-8
Does match and matchend not work with a negative lookbehind?

(please see attachment if the search string doesn't show up correct)

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