<?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]));
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