that begins with <code>/hello/</code> followed by a sequence of alphabetic characters. <code>:alpha</code> applies a route constraint that matches only alphabetic characters.
<ul>
<li>Full route constraint reference: <a href="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/routing#route-constraint-reference">https://docs.microsoft.com/en-us/aspnet/core/fundamentals/routing#route-constraint-reference</a>.</li>
</ul>
</li>
</ul>
<p>The second segment of the URL path, <code>{name:alpha}</code>:</p>
<