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<?php $str = '001110000100001100001'; preg_match_all('~ (?<=\K1) .... 1 ~x', $str, $matches); print_r($matches[0]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 100001 [1] => 100001 [2] => 100001 )

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