beliefer opened a new pull request #27631: [SPARK-30763][SQL][FOLLOWUP] Fix java.lang.IndexOutOfBoundsException No group 1 for regexp_extract URL: https://github.com/apache/spark/pull/27631 ### What changes were proposed in this pull request? This PR follows https://github.com/apache/spark/pull/27508 and used to spark2.4. ### Why are the changes needed? Fix a bug `java.lang.IndexOutOfBoundsException No group 1` ### Does this PR introduce any user-facing change? Yes ### How was this patch tested? New UT.
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