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https://issues.apache.org/jira/browse/LUCENE-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598778#comment-13598778
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Uwe Schindler commented on LUCENE-4822:
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In my opinion, the abstract isKeyword() methods should take no arguments and
use the CharTermAttribute directly (it would then be consistent to the accept()
method of the abstract base class
[FilteringTokenFilter|http://lucene.apache.org/core/4_1_0/analyzers-common/org/apache/lucene/analysis/util/FilteringTokenFilter.html]
of e.g. StopFilter). We would also need no spare CharsRef, as
CharTermAttribute implements CharSequence, so Matcher can handle it directly
without cloning.
The explicit access to the buffer, offset and length is implementation specific
to only the one backed by CharArraySet.
> 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
>
>
> 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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