code/Debug/Model/Service.php
public function searchConfig($query)
    {
        $configArray = array();

        $configArray = Mage::helper('sheep_debug')->xml2array($this->getConfig()->getNode(), $configArray);

        $results = array();
        $configKeys = array_keys($configArray);
        foreach ($configKeys as $configKey) {
            if (strpos($configKey, $query) !== FALSE) {
                $results[$configKey] = $configArray[$configKey];
            }
        }

        return $results;
    }
public function searchConfig($query)
    {
        $configArray = array();

        $configArray = Mage::helper('sheep_debug')->xml2array($this->getConfig()->getNode(), $configArray);

        $results = array();
        $configKeys = array_keys($configArray);
        foreach ($configKeys as $configKey) {
            if (strpos($configKey, $query) !== FALSE) {
                $results[$configKey] = $configArray[$configKey];
            }
        }

        return $results;
    }
Searches configuration keys

@param string $query
@return array