Online PHP editor | refs for BItLN

<?php $string = 'a{ra:calc(*(la)100%);font-s'; $string_regex = '((?<!\\\\)(?:\\\\\\\\)*(\'|")(?:.*?[^\\\\])??(?:\\\\\\\\)*\\2)'; $comment_regex = '(\\/\\*(?:(?!\\*\\/).)*\\*\\/)'; $url_regex = '(?<=:| |,|\$|\$)(url)\\s*(\$)\\s*((?:[^()]+|(?2))*?)\\s*(\$)'; $calc_regex = '(?<=:| |,|\$|\$)(calc)\\s*(\$)\\s*((?:[^()]+|(?2))*?)\\s*(\$)'; $string = preg_match('/'.$calc_regex.'/si', $string, $matches); var_dump($matches);