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<?php $string = '1-2 дня 4-5дня 1день 8дней'; preg_match_all('/([\d+-]+)\s*д(?:ень|ня|ней)/', $string, $matches); print_r($matches[1]);
Output for 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
Array ( [0] => 1-2 [1] => 4-5 [2] => 1 [3] => 8 )
preferences:
116.5 ms | 1535 KiB | 4 Q