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https://issues.apache.org/jira/browse/LUCENE-8207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16404537#comment-16404537
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Adrien Grand commented on LUCENE-8207:
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If half your searches are case-insensitive, then a better approach would be to
index the field twice: once preserving case, and once with lowercasing. This
will make your queries more efficient.
> Add case insensitive support to RegExp
> --------------------------------------
>
> Key: LUCENE-8207
> URL: https://issues.apache.org/jira/browse/LUCENE-8207
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Vincent Arnaud
> Priority: Major
> Attachments: LUCENE-8207.patch
>
>
> This ticket proposes to add case insensitive flag _(?i)_ as in Java to RegExp.
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