## Why is this an issue?

When explicitly setting the region on an AWS Client, you should always prefer providing the value from the Enum Regions instead of a hardcoded String. This will allow you to transparently support any change in the API and avoid mistakes.

This rule reports an issue when a hardcoded string is used instead of an available enum value.

### Noncompliant code example

    AmazonS3ClientBuilder.standard().withRegion("eu_west_1").build();

### Compliant solution

    AmazonS3ClientBuilder.standard().withRegion(Regions.EU_WEST_1).build();