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https://issues.apache.org/jira/browse/LUCENE-9336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Harwood resolved LUCENE-9336.
----------------------------------
    Fix Version/s: master (9.0)
       Resolution: Fixed

Fixed in 
https://github.com/apache/lucene-solr/commit/1efce5444dd40142c55c5a3a30eeebc7b86796c3

> RegExp.java - add support for character classes like \w
> -------------------------------------------------------
>
>                 Key: LUCENE-9336
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9336
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/other
>            Reporter: Mark Harwood
>            Assignee: Mark Harwood
>            Priority: Major
>             Fix For: master (9.0)
>
>
> Character classes commonly used in regular expressions like \s for whitespace 
> are not currently supported and may well be returning false negatives because 
> they don't throw any "unsupported" errors. 
> The proposal is that the RegExp class add support for the set of character 
> classes [defined by Java's Pattern 
> API|https://docs.oracle.com/javase/tutorial/essential/regex/pre_char_classes.html]
> I can work on a patch if we think this is something we want to consider.



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