nrc commented on issue #11946:
URL: https://github.com/apache/datafusion/issues/11946#issuecomment-2298401080

   Related to this, `substring` in Postgres supports regex matching (see 
https://www.postgresql.org/docs/current/functions-matching.html), would it be 
reasonable for DataFusion to also support it?
   
   The currently accepted argument types are:
   
   ```
                       Exact(vec![Utf8, Int64]),
                       Exact(vec![LargeUtf8, Int64]),
                       Exact(vec![Utf8, Int64, Int64]),
                       Exact(vec![LargeUtf8, Int64, Int64]),
                       Exact(vec![Utf8View, Int64]),
                       Exact(vec![Utf8View, Int64, Int64]),
   ```
   
   Postgres's regex substring takes a string, a pattern, and an escape 
character, so I don't think there would be a conflict.


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