system/classes/Collection.php
protected function getName($name)
    {
        preg_match("/off([0-9]+)/", $name, $nameMatch);
        if (isset($nameMatch[1])) {
            $name = (int) $nameMatch[1];
        }
        return $name;
    }
protected function getName($name)
    {
        preg_match("/off([0-9]+)/", $name, $nameMatch);
        if (isset($nameMatch[1])) {
            $name = (int) $nameMatch[1];
        }
        return $name;
    }
Find the name/offset of a resource.
If trying access resource "off0" this should grab the first
resource stored. Which means removing the "off" part and making
the name of the resource sought simply the number 0.

@param $name The designed resource. A name or offset.
@return Mixed