title: Removing words using RegExp
body: <p>I have a string with tags.
  <code>"&lt;blue&gt;Hello, &lt;red&gt;world&lt;/red&gt;!&lt;/blue&gt;"</code>. And I have to get this string without tags using RegExp. 
  I wrote this code, but I think that it can be easier. 
  <code>str.split('&lt;red&gt;').join('').split('&lt;/red&gt;').join('').split('&lt;/blue&gt;').join('').split('&lt;blue&gt;').join('');</code>
  <br> Please, help me!</p>