cebe\markdown\inline\LinkTrait::lookupReference PHP Method

    protected function lookupReference($key)
    {
        $normalizedKey = preg_replace('/\\s+/', ' ', $key);
        if (isset($this->references[$key]) || isset($this->references[$key = $normalizedKey])) {
            return $this->references[$key];
        }
        return false;
    }