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<?php preg_match('~a(?=(b|b\K))b~', 'abc', $matches); print_r($matches); preg_match('~a(?=(bx|b\K))b~', 'abc', $matches); print_r($matches);
Output for git.master_jit, git.master
Array ( [0] => ab [1] => b ) Array ( [0] => [1] => b )

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