title: How to match the character '<' not followed by ('a' or 'em' or 'strong')?
body: <p>How would I make a regular expression to match the character <code>&lt;</code> not followed by (<code>a</code> or <code>em</code> or <code>strong</code>)</p>
  
  <p>So <code>&lt;hello</code> and <code>&lt;string</code> would match, but <code>&lt;strong</code> wouldn't.</p>