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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568966#comment-16568966 ] 

ASF GitHub Bot commented on FLINK-9990:
---------------------------------------

walterddr commented on a change in pull request #6448: [FLINK-9990] [table] Add regex_extract supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6448#discussion_r207694473
 
 

 ##########
 File path: docs/dev/table/sql.md
 ##########
 @@ -1842,6 +1842,16 @@ RPAD(text string, len integer, pad string)
     <tr>
       <td>
         {% highlight text %}
+REGEX_EXTRACT(str string, regex string, extractIndex integer)
+{% endhighlight %}
+      </td>
+      <td>
+        <p>Returns the string str extracted using specified regex pattern and index. If str or regex is null, returns null. E.g. <code>REGEX_EXTRACT('foothebar', 'foo(.*?)(bar)', 2)</code> returns <code>bar</code>.</p>
 
 Review comment:
   Also similar to SQL array, might be good to point out that the index starts with 1.

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> 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 &amp; SQL
>            Reporter: vinoyang
>            Assignee: vinoyang
>            Priority: Minor
>              Labels: pull-request-available
>
> 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}
> 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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