title: Regex to find whole word in text but case insensitive
body: <p>I have the following text:</p>
  
  <blockquote>
    <p>I like a bit of rum with my crumble pie.</p>
  </blockquote>
  
  <p>I want to build a regex search expression to return just the word 'rum' not 'crumble' as well. Also I need it to be case insensitive.</p>