title: Splitting a string into chunks of a certain size
body: <p>Suppose I had a string:</p>
  <pre><code>string str = &quot;1111222233334444&quot;; 
  </code></pre>
  <p>How can I break this string into chunks of some size?</p>
  <p>e.g.,  breaking this into sizes of 4 would return strings:</p>
  <pre><code>&quot;1111&quot;
  &quot;2222&quot;
  &quot;3333&quot;
  &quot;4444&quot;
  </code></pre>