hotfix: uncomment regexp_match function docs

content/influxdb/cloud-iox/reference/sql/functions/regular-expression.md

@@ -14,17 +14,15 @@ influxdb/cloud-iox/tags: [regular expressions, sql]
 The InfluxDB SQL implementation uses the POSIX regular expression syntax and
 supports the following regular expression functions:
 
-<!-- - [regexp_match](#regexp_match) -->
+- [regexp_match](#regexp_match)
 - [regexp_replace](#regexp_replace)
 
-<!--
-
 ## regexp_match
 
 Returns a list of regular expression matches in a string.
 
 ```sql
-regexp_match(str, regexp)
+regexp_match(str, regexp, flags)
 ```
 
 ##### Arguments
@@ -33,8 +31,36 @@ regexp_match(str, regexp)
   Can be a constant, column, or function, and any combination of string operators.
 - **regexp**: Regular expression to match against.
   Can be a constant, column, or function.
+- **flags**: Regular expression flags that control the behavior of the
+  regular expression. The following flags are supported.
+  - **i**: (insensitive) Ignore case when matching.
 
--->
+{{< expand-wrapper >}}
+{{% expand "View `regexp_replace` query example" %}}
+
+_The following example uses the sample data set provided in
+[Get started with InfluxDB tutorial](/influxdb/cloud-iox/get-started/write/#construct-line-protocol)._
+
+{{% note %}}
+`regexp_match` returns a _list_ Arrow type, which is not supported by InfluxDB.
+Use _bracket notation_ to reference a value in the list.
+Lists use 1-based indexing.
+{{% /note %}}
+
+```sql
+SELECT DISTINCT
+  room,
+  regexp_match(room::STRING, '.{3}')[1] AS regexp_match
+FROM home
+```
+
+| room        | regexp_match |
+| :---------- | :----------- |
+| Kitchen     | Kit          |
+| Living Room | Liv          |
+
+{{% /expand %}}
+{{< /expand-wrapper >}}
 
 ## regexp_replace