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<?php $word = 'umweltfreundilch'; //real life example :/ preg_match('/^(?U)(.*[aeiouyäöü][^aeiouyäöü])(.*)$/Xu', $word, $matches); var_dump($matches);
Output for 5.5.38, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array(3) { [0]=> string(16) "umweltfreundilch" [1]=> string(2) "um" [2]=> string(14) "weltfreundilch" }

preferences:
115.01 ms | 411 KiB | 6 Q