title: Split string with multiple-character delimiter
body: <p>say I have the following string:</p>
  <pre><code>&quot;Hello there. My name is Fred. I am 25.5 years old.&quot;
  </code></pre>
  <p>I want to split this into sentences, so that I have the following list:</p>
  <pre><code>[&quot;Hello there&quot;, &quot;My name is Fred&quot;, &quot;I am 25.5 years old&quot;]
  </code></pre>
  <p>As you can see, I want to split the string on all occurrences of the string <code>&quot;. &quot;</code>, not any occurrence of either <code>&quot;.&quot;</code> or <code>&quot; &quot;</code>.  Python's <code>str.split()</code> will not work in this case because it will treat each character of the string as a separate delimiter, rather than the whole string as a multi-character delimiter.  Is there a simple way to solve this problem?</p>