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https://issues.apache.org/jira/browse/LANG-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038983#comment-13038983
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Eli Lindsey commented on LANG-684:
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Any feedback on the patch?
> Levenshtein Distance Within a Given Threshold
> ---------------------------------------------
>
> Key: LANG-684
> URL: https://issues.apache.org/jira/browse/LANG-684
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.*
> Reporter: Eli Lindsey
> Priority: Minor
> Fix For: 3.x
>
> Attachments: LevenshteinDistanceWithThreshold.patch
>
>
> It'd be nice to have a function that calculates the Levenshtein distance only
> if it's within some integer threshold.
> Oftentimes you care less about the actual LD and more about it being within a
> certain range. This common, limited computation can be performed much faster
> than the normal unbounded LD method; instead of O(nm), you can do it in O(km)
> (n and m are string lengths, k is the threshold).
> Also, providing a function like this makes it easier for library users to
> rewrite the unbounded Levenshtein function to run in O(dm) time (d is the
> edit distance) if necessary.
> I'm attaching a patch that implements this function and adds appropriate test
> cases.
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