# UUID V5

> Supported in: Batch, Faster, Streaming

Generates a deterministic UUID v5 from a namespace UUID and a name string using SHA-1 hashing (RFC 4122). The same namespace and name will always produce the same UUID. Returns null if the namespace is not a valid UUID.

**Expression categories:** String

## Declared arguments

* **Name:** The name string to hash with the namespace to produce a deterministic UUID.<br>*Expression\<String>*
* **Namespace UUID:** A valid UUID string to use as the namespace.<br>*Expression\<String>*

**Output type:** *String*

## Examples

### Example 1: Base case

**Description:** Generate a deterministic UUID v5 from a namespace UUID and name string.

**Argument values:**

* **Name:** `name`
* **Namespace UUID:** `namespace`

| namespace | name | **Output** |
| ----- | ----- | ----- |
| 6ba7b810-9dad-11d1-80b4-00c04fd430c8 | hello | 9342d47a-1bab-5709-9869-c840b2eac501 |
| 6BA7B810-9DAD-11D1-80B4-00C04FD430C8 | hello | 9342d47a-1bab-5709-9869-c840b2eac501 |
| 6ba7b811-9dad-11d1-80b4-00c04fd430c8 | https://example.com | 4fd35a71-71ef-5a55-a9d9-aa75c889a6d0 |

***

### Example 2: Null case

**Argument values:**

* **Name:** `name`
* **Namespace UUID:** `namespace`

| namespace | name | **Output** |
| ----- | ----- | ----- |
| *null* | hello | *null* |
| 6ba7b810-9dad-11d1-80b4-00c04fd430c8 | *null* | *null* |
| *null* | *null* | *null* |

***

### Example 3: Edge case

**Argument values:**

* **Name:** `name`
* **Namespace UUID:** `namespace`

| namespace | name | **Output** |
| ----- | ----- | ----- |
| not-a-uuid | hello | *null* |
| *empty string* | hello | *null* |
| 1-2-3-4-5 | hello | 85cac0b3-f821-5e29-ad03-7e26926dfdc3 |
| +1-2-3-4-5 | hello | 85cac0b3-f821-5e29-ad03-7e26926dfdc3 |
| 123456789-1-1-1-1 | hello | 521c6c9d-6fff-59c1-aaed-00192ec1d25c |
| 0000000000000000000001-1-1-1-1 | hello | 8bfab908-d58d-575d-b302-93686b232a3d |
| 6ba7b8109dad11d180b400c04fd430c8 | hello | *null* |
| {6ba7b810-9dad-11d1-80b4-00c04fd430c8} | hello | *null* |
| urn\:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8 | hello | *null* |

***