If you're going to do this then make sure you use 302 redirects (temporary) and not 301 (permanent). Otherwise browsers (and Google) will cache the redirect, then if your fuzzy matched URL one day becomes a real URL, people might not be able to access it.

Someone could seriously mess up your site by simply publishing their own page with many invalid links to your site, basically a dictionary attack, and if Google was to crawl those links, they'll cache all the redirects, and you'll have a hard time rectifying that if you were wanting to then publish pages on those URLs.

Also to reiterate other suggestions - your idea is not great for many reasons already stated (even with 302s). As suggested, just simply have a 404 page with a "Did you mean [x]?" instead. Use your same logic to present [x] in that example, rather than redirect to it.