surawut-jirasaktavee commented on PR #59422:
URL: https://github.com/apache/spark/pull/59422#issuecomment-6170989898

   Thanks! Opened https://github.com/apache/spark/pull/59465 against 
`branch-4.0`. It changes Example 2 to `(\d+)(a|b|m)` with idx `1`, which 
returns `1` with and without this change. I'll also address the review: decode 
the subject string once in the generated code, reword the Scala and PySpark 
docs to say the position is counted in `str`, and add a `spark.sql.legacy.*` 
flag that keeps ignoring `idx`.
   


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