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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975299#comment-13975299
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Robert Muir commented on LUCENE-5620:
-------------------------------------

I would simply add a check to the capturingfilter in incrementToken:
{code}
if (!captureAtt.isEmpty()) {
  throw new IllegalStateException("No.");
}
{code}


> LowerCaseFilter.preserveOriginal
> --------------------------------
>
>                 Key: LUCENE-5620
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5620
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Mike Sokolov
>         Attachments: LUCENE-5620.patch, LUCENE-5620.patch
>
>
> Following closely the model of LUCENE-5437 (which worked on 
> ASCIIFoldingFilter), this patch adds the ability to preserve the original 
> token to LowerCaseFilter.  This is useful if you want an all-lowercase search 
> term to match without regard to case, while search terms with uppercase 
> letters match in a case-sensitive manner. 



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