Another way returning the split parts only: 
perl -E 'say for split /\S+\s+\S+\s+\S+\K\s+/, "1 2 3 4 5 6 7 8 9"'

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Or written shorter: 
perl -E 'say for split /(?:\S+\K\s+){3}/, "1 2 3 4 5 6 7 8 9"'

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In reply to Re: Split at specific spaces by rubasov
in thread Split at specific spaces by perl_search_m

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