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<?php $str = "1111 2222 3333 4444 5555 6666"; if (preg_match('~\A(?:\d{4}\s?)+\z~', $str)) { print_r(preg_split('~\s~', $str)); }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1111 [1] => 2222 [2] => 3333 [3] => 4444 [4] => 5555 [5] => 6666 )

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