<?php $input = "(Field1 = 'Val and ue1') and (Field2 = 'Valu or e2') or (Field3 = 'Value3')"; preg_match_all('~(?:^\(|\G(?!^)(?:\) | \())\K(?:(?:and|or)|[^)]+)~', $input, $m); print_r($m[0]);
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