title: Finding least common elements in a list
body: <p>I want to generate an ordered list of the least common words within a large body of text, with the least common word appearing first along with a value indicating how many times it appears in the text.</p>
  
  <p>I scraped the text from some online journal articles, then simply assigned and split;</p>
  
  <pre><code>article_one = """ large body of text """.split() 
  =&gt; ("large","body", "of", "text")
  </code></pre>
  
  <p>Seems like a regex would be appropriate for the next steps, but being new to programming I'm not well versed-
  If the best answer includes a regex, could someone point me to a good regex tutorial other than pydoc? </p>