The question on SO which prompted me to come ask: What would be the most rational way to parse youtube video link for video ID in PHP?
In this case, the user has posted a question that seems to be an exact duplicate. However, the user posts a small code snippet and asks how to get a particular part. The duplicate question linked to deals with any YouTube URL, and as such has a very complex regex answer to accompany it. However, this question is on a specific URL. At this point, it is unclear whether the poster cares about the additional YouTube formats. My answer has a very precise code snippet using built-in PHP functions for parsing various parts of a URL. Thus, the answer is very different. It seems to me this is not an exact duplicate as per my understanding of When is a duplicate question not a duplicate? and What is an exact duplicate?.
Obviously, I'd like to see the duplicate question status removed on this particular question as I have the answer, but what should I do about it and other similar situations? Build the rest of my reputation up to 3000 and vote to reopen?
Edit: It also seems to me the fact it got 8 upvotes before being closed as a duplicate credibility to the fact that it isn't a duplicate. In my experience, answers to duplicate questions don't get many upvotes that quickly.