title: How RouterLink and RouterLinkActive work?
body: <p>Consider the following example:</p>
  
  <pre><code>&lt;a routerLink="/user/bob" routerLinkActive="active-link"&gt;Bob&lt;/a&gt;
  </code></pre>
  
  <p>The active-link CSS class will be added to the a tag when the current URL is either "/user" or "/user/bob", </p>
  
  <p>How could I enforce an exact match?</p>