[jira] [Created] (FLINK-9990) Add regex_extract supported in TableAPI and SQL

[Shang Yuanchun (Jira)]

vinoyang created FLINK-9990:
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             Summary: Add regex_extract supported in TableAPI and SQL
                 Key: FLINK-9990
                 URL: https://issues.apache.org/jira/browse/FLINK-9990
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: vinoyang
            Assignee: vinoyang


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

For example : 
{code:java}
regexp_extract('foothebar', 'foo(.*?)(bar)', 2) // returns 'bar.'

{code}



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