public DescribeSourceRegionsRequest withRegionName(String regionName) {
        setRegionName(regionName);
        return this;
    }
<p>
The source Amazon Web Services Region name. For example, <code>us-east-1</code>.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must specify a valid Amazon Web Services Region name.
</p>
</li>
</ul>

@param regionName
       The source Amazon Web Services Region name. For example, <code>us-east-1</code>.</p>
       <p>
       Constraints:
       </p>
       <ul>
       <li>
       <p>
       Must specify a valid Amazon Web Services Region name.
       </p>
       </li>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/DescribeSourceRegionsRequest.java