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<?php $regex = "/(.*volume:\s+)([0-9]+)(%)/i"; $text = "volume: 90%"; preg_match($regex , $text, $matches); var_dump($matches);
based on 2BQKX
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(11) "volume: 90%" [1]=> string(8) "volume: " [2]=> string(2) "90" [3]=> string(1) "%" }