I want to ask, how you check for duplicates.
Background: The company I work for has a wiki, Confluence, set up by me. With more and more articles coming along, duplicates are starting to pop up. They're not really duplicates, since their title and tags distinguishes them, but their content is mostly the same. We've already introduced a "search before post" rule, but it only helped a little.
Now, to prevent duplicates, I want to check for similar articles based on the title. I've found out, that you could use the Jaro-Winkler distance to get the similarity of words, but that won't do any good I think, however, I'm curious, how other wikis, Stack Exchange and other CMSs do it.
An example, why we need such a thing: Worker A searches for an article about the setup of the shipment software of DHL. He doesn't find one, so he writes one. One week later, Worker B searches for the same, but uses a slightly different terms and ends up not finding the article, because the words he used to search aren't in the title nor the tags, so he creates an article as well.
So, as said earlier, how does Stack Exchange find "question that may already have your answer"?