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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