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https://issues.apache.org/jira/browse/LUCENE-5674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nitzan Shaked updated LUCENE-5674:
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Attachment: subseqfilter.patch
Latest patch, all commits squashed into one
> A new token filter: SubSequence
> -------------------------------
>
> Key: LUCENE-5674
> URL: https://issues.apache.org/jira/browse/LUCENE-5674
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/other
> Reporter: Nitzan Shaked
> Priority: Minor
> Attachments: subseqfilter.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> A new configurable token filter which, given a token breaks it into sub-parts
> and outputs consecutive sub-sequences of those sub-parts.
> Useful for, for example, using during indexing to generate variations on
> domain names, so that "www.google.com" can be found by searching for
> "google.com", or "www.google.com".
> Parameters:
> sepRegexp: A regular expression used split incoming tokens into sub-parts.
> glue: A string used to concatenate sub-parts together when creating
> sub-sequences.
> minLen: Minimum length (in sub-parts) of output sub-sequences
> maxLen: Maximum length (in sub-parts) of output sub-sequences (0 for
> unlimited; negative numbers for token length in sub-parts minus specified
> length)
> anchor: Anchor.START to output only prefixes, or Anchor.END to output only
> suffixes, or Anchor.NONE to output any sub-sequence
> withOriginal: whether to output also the original token
> EDIT: now includes tests for filter and for factory.
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