While making an MP3-renaming script, which attacks a problem similar to yours, I used a combination of Metaphone and "distance" modules. My approach:
- Get a list of "known-good" words. I use already-verified MP3 filenames as a source of these.
- Calculate their Metaphones.
- Calculate the Metaphone of any new words and look for matches. If none, see if there are any matches with a distance of 1 or 2. Distances larger than 2 produce too many matches.
- Have the user confirm the 'corrections'.
It's not an exact science, and human intervention is unavoidable if correctness matters.
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