Code for better match

Currently the requested url is matched against the entire permalink. I think it would be better instead to match it to the slug of the existing posts.

function wbz404_rankPermalinks in functions.php could use the following code for a better match.

$slug = explode('/',$urlParts['path']);
$slug = array_pop($slug);
$levscore = levenshtein($url, $slug,1,1,1);

https://www.ads-software.com/plugins/404-redirected/