yanghua 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_r207699629
##########
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:
it just returns the extractIndex-th value of match group array, just one
element not an array, refers to :
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF (please
search 'regex_extract')
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