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<?php $test = 'ala or OR || kota'; preg_match_all('/\b(?:(?!and|or|if)\w)+\b/i', $test, $result); var_dump($result); ?>
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(1) { [0]=> array(2) { [0]=> string(3) "ala" [1]=> string(4) "kota" } }
preferences:
177.55 ms | 404 KiB | 215 Q