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https://issues.apache.org/jira/browse/LUCENE-7437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15470302#comment-15470302
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Michael Pichler commented on LUCENE-7437:
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This problem with underscores and wildcards seems to exist for quite a while,
see also:
http://stackoverflow.com/questions/3458221/lucene-net-search-and-underscore
> QueryParser with wildcard search does not use Analyzer's tokenizer
> ------------------------------------------------------------------
>
> Key: LUCENE-7437
> URL: https://issues.apache.org/jira/browse/LUCENE-7437
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: 6.2
> Reporter: Michael Pichler
> Attachments: LuceneTest.java
>
>
> Using a tokenizer that splits at underscores (e.g. SimpleAnalyzer) splits
> "qwert_asdfghjkl" into two words at the time of indexing.
> Searches for "qwert asdf*" or "qwert_asdfghjkl" work as expected.
> However, when a query contains wildcards, e.g. "qwert_asdf*" the query parser
> does not use the tokenizer of its analyzer to split the words and thus finds
> no result.
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