title: How to split a string into 2 at the last occurrence of an underscore character
body: <p>Given a string with a number of underscore characters, how can it be split into two substrings around the last underscore character?</p>
  <p>eg. &quot;a_b_c&quot; =&gt; [&quot;a_b&quot;, &quot;_c&quot;]</p>