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<?php $list = '1,2,3,4'; preg_match_all('/^\d+|\G(?!^)(,?\d+)\K/', $list, $matches); print_r(array_map('array_filter', $matches));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [1] => ,2 [2] => ,3 [3] => ,4 ) )

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