## Syntax
```mermaid
%%{init: {
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'themeVariables': {
'fontSize': '11px',
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flowchart LR
Start((START)) --> IS_URI[IS_URI]:::quoted
IS_URI --> End((END))
```
## Purpose
The `IS_URI` SQL function evaluates to `true` when the value provided is a valid Uniform Resource Identifier ("URI") according to [RFC 3986](https://www.rfc-editor.org/info/rfc3986).
Parameters:
- Value (`varchar2`): value to test.
Returns: whether the value provided is a valid URI as a `boolean`.
## Examples
The following example verifies conformance of a URI:
```sql
select is_uri('https://invantive.eu')
----------------
true
```
The following example verifies conformance of a URI:
```sql
select is_uri('https:invantive.eu')
----------------
false
```