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https://issues.apache.org/jira/browse/LUCENE-9386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118717#comment-17118717
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Mark Harwood commented on LUCENE-9386:
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I opened [https://github.com/apache/lucene-solr/pull/1541]
> RegExpQuery - add case insensitive matching option
> --------------------------------------------------
>
> Key: LUCENE-9386
> URL: https://issues.apache.org/jira/browse/LUCENE-9386
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Mark Harwood
> Priority: Minor
>
> In searches sometimes case sensitivity is important and sometimes not.
> However, users don't want to have to index two versions of their data
> (lowercased and original) in order to service both case sensitive and case
> insensitive queries. To get around this users have been commonly seen to take
> a user query e.g. `powershell.exe` and search for it with the regex
> `[Pp][Oo][Ww][Ee][Rr][Ss][Hh][Ee][Ll][Ll]\.[Ee][Xx][Ee]`.
> The proposal is that we add an extra "case insensitive" option to the RegExp
> query flags to automatically do this sort of expansion when we create
> Automatons.
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