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We all love a little regex hacking now and then. I loved it enough to even write a regex matching library called libtre. The cool thing about this library is that it supports searching for approximate matches. This approximate matching feature of this library is being used for things like improving OCR results, generating “did you mean?” suggestions for users’ searches, and filtering spam. The library comes with a 2-clause BSD license so you can use it for pretty much whatever you want.