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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596346#comment-13596346
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Walter Underwood commented on LUCENE-3907:
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Back grams would work for leading wildcards. They might be useful for things
where the head is at the end (tail-first?), like domain names.
Not super-useful, but it is a small part of the code in the tokenizer.
> Improve the Edge/NGramTokenizer/Filters
> ---------------------------------------
>
> Key: LUCENE-3907
> URL: https://issues.apache.org/jira/browse/LUCENE-3907
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Uwe Schindler
> Labels: gsoc2012, lucene-gsoc-12
> Fix For: 4.2
>
>
> Our ngram tokenizers/filters could use some love. EG, they output ngrams in
> multiple passes, instead of "stacked", which messes up offsets/positions and
> requires too much buffering (can hit OOME for long tokens). They clip at
> 1024 chars (tokenizers) but don't (token filters). The split up surrogate
> pairs incorrectly.
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