Quelques exemples d'expressions régulières utilisées en PHP :

// 1- remove recursively the content of for (), [] and {}
// 2- removes escaped ' and "
// 3- removes content betweend '' and "" (no recursion needed)
$embracerPattern = "/\[([^\[\]]++|(?R))*+\]|\(([^\(\)]++|(?R))*+\)|{([^{}]++|(?R))*+}/";
$escapedQuotePattern = "/\\\\'|\\\\\"/";
$quotedStringPattern = "/'([^']++)*+'|\"([^\"]++)*+\"/";
 
//replace escaped quotes with html entities
$escapedQuotePattern = "/\\\\'/";
$call['code'] = preg_replace($escapedQuotePattern, '\&#apos;', $call['code']);
$escapedQuotePattern = "/\\\\\"/";
$call['code'] = preg_replace($escapedQuotePattern, '\&#quot;', $call['code']);
 
//replace commas between remaining (double) quotes with html entities
$quotedStringPattern = "/'([^']++)*+'|\"([^\"]++)*+\"/";
$call['code'] = preg_replace_callback(
    $quotedStringPattern,
    function ($matches) {
        return str_replace(',',',',$matches[0]);
    },
    $call['code']
);
 
//replace commas between parentheses, braces or brackets
$embracerPattern = "/\[([^\[\]]++|(?R))*+\]|\(([^\(\)]++|(?R))*+\)|{([^{}]++|(?R))*+}/";
$call['code'] = preg_replace($embracerPattern, '', $call['code']);
 
//get the list of given parameters
$results = preg_split('/,/', $call['code']);