function _checkAt($entry)
    {
        $ret = false;
        $opening = array_keys($this->_delimiters);
        $closing = array_values($this->_delimiters);
        //Getting the value (at is only allowd in values)
        if (strrpos($entry, '=') !== false) {
            $position = strrpos($entry, '=');
            $proceed = true;
            if (substr($entry, $position - 1, 1) == '\\') {
                $proceed = false;
            }
            while (!$proceed) {
                $substring = substr($entry, 0, $position);
                $position = strrpos($substring, '=');
                $proceed = true;
                if (substr($entry, $position - 1, 1) == '\\') {
                    $proceed = false;
                }
            }
            $value = trim(substr($entry, $position + 1));
            $open = 0;
            $char = '';
            $lastchar = '';
            for ($i = 0; $i < strlen($value); $i++) {
                $char = substr($this->content, $i, 1);
                if (in_array($char, $opening) && ('\\' != $lastchar)) {
                    $open++;
                } elseif (in_array($char, $closing) && ('\\' != $lastchar)) {
                    $open--;
                }
                $lastchar = $char;
            }
            //if open is grater zero were are inside an entry
            if ($open > 0) {
                $ret = true;
            }
        }
        return $ret;
    }