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<?php $str = 'aktuell/blog/cat1/cat2/cat3'; $uri_arr = explode("/",$str); $cat = array(); array_map(function($v) use (&$cat){ preg_match('/^cat\d$/',$v,$matches); if(count($matches) > 0){ $cat[] = $matches[0]; } },$uri_arr); print_r($cat);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 ( [0] => cat1 [1] => cat2 [2] => cat3 )

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