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<?php $string = 'a{ra:calc(*(la)100%);font-s'; $calc_regex = '(?<=:| |,|\\(|\\))(calc)\\s*(\\()\\s*((?:[^()]+|\\((?3)\\))*?)\\s*(\\))'; $string = preg_match('/'.$calc_regex.'/si', $string, $matches); var_dump($matches);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(5) { [0]=> string(15) "calc(*(la)100%)" [1]=> string(4) "calc" [2]=> string(1) "(" [3]=> string(9) "*(la)100%" [4]=> string(1) ")" }
Output for 4.4.3 - 4.4.9, 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
array(0) { }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.2, 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
array(5) { [0]=> string(10) "calc(*(la)" [1]=> string(4) "calc" [2]=> string(1) "(" [3]=> string(4) "*(la" [4]=> string(1) ")" }

preferences:
246.26 ms | 402 KiB | 394 Q