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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