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<?php $string = "Hello World Hey How Are You Doing"; $res = preg_match_all("/(?|(?:^|\h)(?=(\S+(?: \S+){2}))|(\S+))/", $string, $matches); print_r($matches[1]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Hello World Hey [1] => Hello [2] => World Hey How [3] => World [4] => Hey How Are [5] => Hey [6] => How Are You [7] => How [8] => Are You Doing [9] => Are [10] => You [11] => Doing )

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