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https://issues.apache.org/jira/browse/FLINK-9990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569043#comment-16569043
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ASF GitHub Bot commented on FLINK-9990:
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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_r207699504
##########
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:
Good point. so another question is: does `REGEX_EXTRACT` returns an array of
String similar to how Pattern/Matcher in java does it when extract all
capturing groups? or is it concatenated? If so, what's the delimiter? (since in
the code it seems only `String` type is returned.
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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 & 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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