Compiler.php
private function _quotesRegexpCallback($pregMatchResult) {
        $hash                       = $this->getHash($pregMatchResult[0]);
        $this->_hashesQuoted[$hash] = $pregMatchResult[0];
        return $hash;
    }
private function _quotesRegexpCallback($pregMatchResult) {
        $hash                       = $this->getHash($pregMatchResult[0]);
        $this->_hashesQuoted[$hash] = $pregMatchResult[0];
        return $hash;
    }
Preg match replace callback
@param $pregMatchResult
@return string