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https://issues.apache.org/jira/browse/LUCENE-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598791#comment-13598791
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Uwe Schindler commented on LUCENE-4822:
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The good thing with isKeyword being parameter-free is the possibility to also
mark "keywords" based on other attributes (e.g. when Kumoroji sets a specific
base form, or if a token has no position increment, or if you have a certain
unicode range like arabic chars that should never be passed to a stemmer,...;
the examples maybe nonsense but shows the possibilities).
> Add PatternKeywordTokenFilter to marks keywords based on regular expressions
> ----------------------------------------------------------------------------
>
> Key: LUCENE-4822
> URL: https://issues.apache.org/jira/browse/LUCENE-4822
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 4.2
> Reporter: Simon Willnauer
> Priority: Minor
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4822.patch, LUCENE-4822.patch
>
>
> today we need to pass in an explicit set of terms that we want to marks as
> keywords. It might make sense to allow patterns as well to prevent certain
> suffixes etc. to be keyworded.
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