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Posted to dev@lucene.apache.org by "Shalin Shekhar Mangar (JIRA)" <ji...@apache.org> on 2016/11/09 08:33:59 UTC
[jira] [Updated] (LUCENE-7465) Add a PatternTokenizer that uses
Lucene's RegExp implementation
[ https://issues.apache.org/jira/browse/LUCENE-7465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shalin Shekhar Mangar updated LUCENE-7465:
------------------------------------------
Fix Version/s: (was: 6.3)
6.4
> Add a PatternTokenizer that uses Lucene's RegExp implementation
> ---------------------------------------------------------------
>
> Key: LUCENE-7465
> URL: https://issues.apache.org/jira/browse/LUCENE-7465
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7465.patch, LUCENE-7465.patch
>
>
> I think there are some nice benefits to a version of PatternTokenizer that uses Lucene's RegExp impl instead of the JDK's:
> * Lucene's RegExp is compiled to a DFA up front, so if a "too hard" RegExp is attempted the user discovers it up front instead of later on when a "lucky" document arrives
> * It processes the incoming characters as a stream, only pulling 128 characters at a time, vs the existing {{PatternTokenizer}} which currently reads the entire string up front (this has caused heap problems in the past)
> * It should be fast.
> I named it {{SimplePatternTokenizer}}, and it still needs a factory and improved tests, but I think it's otherwise close.
> It currently does not take a {{group}} parameter because Lucene's RegExps don't yet implement sub group capture. I think we could add that at some point, but it's a bit tricky.
> This doesn't even have group=-1 support (like String.split) ... I think if we did that we should maybe name it differently ({{SimplePatternSplitTokenizer}}?).
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