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<?php $string = 'a{ra:calc(*(la)100%);font-s'; $string_regex = '((?<!\\\\)(?:\\\\\\\\)*(\'|")(?:.*?[^\\\\])??(?:\\\\\\\\)*\\2)'; $comment_regex = '(\\/\\*(?:(?!\\*\\/).)*\\*\\/)'; $url_regex = '(?<=:| |,|\\(|\\))(url|calc)\\s*(\\()\\s*((?:[^()]+|(?2))*?)\\s*(\\))'; $string = preg_match('/'.$string_regex.'|'.$comment_regex.'|'.$url_regex.'|'.$calc_regex.'/si', $string, $matches);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $calc_regex in /in/40HHi on line 6

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