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https://issues.apache.org/jira/browse/FLINK-9990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636158#comment-16636158
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ASF GitHub Bot commented on FLINK-9990:
---------------------------------------
xccui commented on a change in pull request #6448: [FLINK-9990] [table] Add
regexp_extract supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6448#discussion_r221666556
##########
File path: docs/dev/table/functions.md
##########
@@ -2963,6 +2989,19 @@ STRING1.replace(STRING2, STRING3)
</td>
</tr>
+ <tr>
+ <td>
+ {% highlight scala %}
+STRING1.regexpExtract(STRING2, INTEGER1)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns a string from <i>STRING1</i> which extracted with a
specified regular expression <i>STRING2</i> and a regex match group index
<i>INTEGER1</i>.</p>
+ <p><b>Note:</b> The regex match group index should starts from 1 and 0
represents matching the whole regexp. In addition, The regex match group index
should not exceed the number of the defined groups.</p>
Review comment:
The regex match group index ~~should~~ starts from 1, and 0 means...
In addition, the index should not...
~~regexp~~ -> regex
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> Add regexp_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
> 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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