title: ruby - delete all files with names matching a pattern
body: <p>I have multiple files (in a folder containing thousands of files), ex:</p>
  <pre><code>...
  page_bonus.txt
  page_code1.txt
  page_code2.txt
  page_text1.txt
  page_text2.txt
  page_text3.txt
  ...
  </code></pre>
  <p>How do I delete all page_code* files?</p>
  <p>Note: I do not wish to use FileUtils or shell</p>