atris commented on PR #8818:
URL: https://github.com/apache/pinot/pull/8818#issuecomment-1155193112

   @gortiz another thing to remember is that neither Lucene nor native FST 
index follow the java regex pattern language.
   
    If you look up the Lucene regex documentation, and look at the FST index 
and LIKE tests in Pinot, you will notice the difference.
   
   Unfortunately, since we do not actually parse the regex engine until deep 
inside the FST territory, we have no way of reporting unknown characters. That 
may be a factor leading to 0 results for your queries


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