title: Vim Regex: Add character before the last word of each line
body: <pre><code>Word1 Word2 Word3 ... Wordx LastWord
  Word1 Word2 Word3 ... Wordx LastWord
  </code></pre>
  
  <p>How could I possibly add "|" before the last word of each line and return the following result using Regex in vim?</p>
  
  <pre><code>Word1 Word2 Word3 ... Wordx | LastWord
  Word1 Word2 Word3 ... Wordx | LastWord
  </code></pre>