-line-signature">
          <span class="returntype"><a href="dart-core/String-class.html">String</a></span>
                  <span class="name ">countryCode</span>
          
</section>
        
                <section class="desc markdown">
          <p>The region subtag for the locale.</p>
<p>This may be null, indicating that there is no specified region subtag.</p>
<p>This is expected to be string registered in the <a href="https://www.iana.org/assignments/language-subtag-registry/language-subtag-regi