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<?php $string = "aa | bb | \"cc | dd\" | 'ee | ff'"; preg_match_all("~(?|\"([^\"]*)\"|'([^']*)'|([^|'\"]+))(?:\s*\|\s*|\z)~", $string, $matches); print_r(array_map(function($x) {return trim($x);}, $matches[1]));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => aa [1] => bb [2] => cc | dd [3] => ee | ff )

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