title: ngShow if interpolated substring equals some substring
body: <p>I have the following <code>title</code>, and I want to <code>show</code> an <code>element</code> <code>if person == some value, e.g family</code>. How can I build that <code>expression</code> with <code>ngShow</code>?</p>
  
  <p><code>&lt;h2 class="mat-title" style="text-align:center;"&gt;Register as a {{person}}&lt;/h2&gt;</code></p>