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https://issues.apache.org/jira/browse/LUCENE-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mason updated LUCENE-3979:
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Summary: NGramTokenizer strips whitespace, with no option to keep leading
and trailing whitespace (was: NGramTokenizer)
> NGramTokenizer strips whitespace, with no option to keep leading and trailing
> whitespace
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-3979
> URL: https://issues.apache.org/jira/browse/LUCENE-3979
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 2.9.2, 3.0
> Environment: n/a
> Reporter: David Mason
> Priority: Minor
> Labels: tokenizer, whitespace
> Original Estimate: 5m
> Remaining Estimate: 5m
>
> org.apache.lucene.analysis.ngram.NGramTokenizer removes whitespace, making a
> search for literal strings like " test" and "test " equivalent to "test".
> Searching with relevant whitespace is sometimes desired, particularly where
> ngrams are used.
> This could be fixed by either removing .trim() from the line shown below, or
> by providing a flag to specifically set trimming behaviour (keeping trim=true
> as the default so that existing code using this analyzer is not broken).
> 111: inStr = new String(chars).trim(); // remove any trailing empty strings
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