title: Angular 6: Replace specific string with input field in html string
body: <p>I have following html string that i can fetch from http service:</p>
  
  <pre><code>When uranium was {{1}} to be radioactive, Marie Curie found that the element called {{2}} had the same property.
  </code></pre>
  
  <p>I want to replace {{1}} and {{2}} with reactive form control in angular 5 dynamically. how?</p>