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From "Ahmet Arslan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5674) A new token filter: SubSequence
Date Sun, 25 May 2014 23:13:01 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008475#comment-14008475
] 

Ahmet Arslan commented on LUCENE-5674:
--------------------------------------

What happens when this filter instantiated with a minLen greater than maxLen?

> 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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