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<?php var_dump(preg_match_all('/(.\K)/', 'abcd', $m), $m);
Output for git.master, git.master_jit, rfc.property-hooks
int(4) array(2) { [0]=> array(4) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" } [1]=> array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" } }

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