After finding some files online I needed a way to rename them from their downloaded file name to their original filenames, which were in a text file. Since there were quite a lot of files, I didn't want to do this by hand or copy/paste a lot, so I got reading up on fuzzy text searches and ended up reading the Levenshtein Distance Wikipedia page and some derivative algorithms (Optimal String Alignment and Damerau-Levenshtein)
These worked quite well and helped me automate the whole thing.
Here are the argorithms (direct conversion to awk from their Wikipedia examples) and two example programs to use them.
Search for the string "Brown" in two sentences:
$> awk -f fuzsearch.awk -f prog1.awk search="Brown" <<<$'How Now Brown Cow\nThe Quick Brown Fox Jumps OVer The Lazy Dog'
Search for the string "Monster Dee Dee" in the file episodes.txt using the Damerau-Levenshtein algorithm
(prog2.awk is using a gawk-only feature to traverse an array in sorted order (PROCINFO["sorted_in"]), so this needs gawk to work properly.)
$> gawk -f fuzsearch.awk -f prog2.awk -F'\t' search="Monster Dee Dee" episodes.txt