itschrispeck opened a new pull request, #13005:
URL: https://github.com/apache/pinot/pull/13005

   This PR addresses https://github.com/apache/pinot/issues/12628
   
   This provides functionality to configure a regex library that will be used 
during query execution. 
   
   - `PatternFactory.compile(...)` is used in place of `Pattern.compile(...)`
   - `Pattern` interface added maintains the same semantics as 
`java.util.Pattern`
   - `Matcher` interface added maintains the same semantics as 
`java.util.Matcher`
   
   A new config is added: `pinot.server.query.regex.class`
   Valid values for this config are: `JAVA_UTIL` or `RE2J`.
   
   Some testing showed regex libraries have very different 
strengths/weaknesses, so it seemed best to allow users to choose an 
implementation that works well for them. 
   
   Default behavior is unchanged. 
   
   tag: `feature`


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