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https://issues.apache.org/jira/browse/LUCENE-6993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155035#comment-15155035
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Robert Muir commented on LUCENE-6993:
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I think we should be ok. As far as i understand it, jflex will respect that
unicode directive and the grammar and generate the equivalent state machine.
But regenerating the "old grammars" means we get bugfixes from jflex: e.g.
performance or memory improvements or whatever improved there, so I think its
the right thing to do.
> Update UAX29URLEmailTokenizer TLDs to latest list, and upgrade all
> JFlex-based tokenizers to support Unicode 8.0
> ----------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-6993
> URL: https://issues.apache.org/jira/browse/LUCENE-6993
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Mike Drob
> Assignee: Robert Muir
> Fix For: 6.0
>
> Attachments: LUCENE-6993.patch, LUCENE-6993.patch, LUCENE-6993.patch,
> LUCENE-6993.patch, LUCENE-6993.patch
>
>
> We did this once before in LUCENE-5357, but it might be time to update the
> list of TLDs again. Comparing our old list with a new list indicates 800+ new
> domains, so it would be nice to include them.
> Also the JFlex tokenizer grammars should be upgraded to support Unicode 8.0.
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