Have you tried out one of the standard 'distance' metrics like Hamming distance or Levenstein distance? This would at least give you an objective measure of success. Whether that's something that actually works for what you're trying to achieve is of course an open question, but both Hamming distance matching and Levenstein distance matching (the latter is harder but probably better for your purposes) are very well u…
I made a similar tool and believe that if the author is interested in this route he may prefer the Jaro-Winkler algorithm as it is more highly tailored to names.
Likely he rolled his own solution for the same reason that I did, he is targeting a specific type of names (file names for him) which comes with its own subset of rules that can be incorporated for better matching.