<?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);
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