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      regex_extract is a very useful function, it returns a string based on a regex pattern and a index.

      For example : 

      regexp_extract('foothebar', 'foo(.*?)(bar)', 2) // returns 'bar.'
      

      It is provided as a UDF in Hive, more details please see[1].

      [1]: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF

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            yanghua vinoyang
            yanghua vinoyang
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