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https://issues.apache.org/jira/browse/LUCENE-7646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834347#comment-15834347
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Michael McCandless commented on LUCENE-7646:
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Phew, thanks for bringing closure [~TomMortimer]!
> AutomatonTermsEnum constructor throws a NullPointerException with match-all
> RegExp
> ----------------------------------------------------------------------------------
>
> Key: LUCENE-7646
> URL: https://issues.apache.org/jira/browse/LUCENE-7646
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index, core/other
> Affects Versions: 6.2, 6.3
> Environment: MacOS
> java version "1.8.0_77"
> Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
> Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
> Reporter: Tom Mortimer
> Priority: Minor
> Attachments: LUCENE-7646.patch, RegExpNPE.java
>
>
> When constructing a AutomatonTermsEnum using a CompiledAutomaton with a
> "silly" RegExp (".*.*") a NullPointerException is thrown. Test case attached.
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