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https://issues.apache.org/jira/browse/LUCENE-1702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738280#action_12738280
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Robert Muir commented on LUCENE-1702:
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related to this issue, Steven has added support for unicode text segmentation
properties to the 1.5 dev branch of jflex:
http://sourceforge.net/mailarchive/message.php?msg_name=4A747D60.4090904%40odyssey.net
we should be able to start prototyping a different definition of ALPHANUM, etc
that solves this issue (and improves tokenization of many languages!)
> Thai token type() bug
> ---------------------
>
> Key: LUCENE-1702
> URL: https://issues.apache.org/jira/browse/LUCENE-1702
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/analyzers
> Reporter: Robert Muir
> Priority: Minor
>
> While adding tests for offsets & type to ThaiAnalyzer, i discovered it does
> not type Thai numeric digits correctly.
> ThaiAnalyzer uses StandardTokenizer, and this is really an issue with the
> grammar, which adds the entire [:Thai:] block to ALPHANUM.
> i propose that alphanum be described a little bit differently in the grammar.
> Instead, [:letter:] should be allowed to have diacritics/signs/combining
> marks attached to it.
> this would allow the [:thai:] hack to be completely removed, would allow
> StandardTokenizer to parse complex writing systems such as Indian languages,
> and would fix LUCENE-1545.
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