title: Split string after last underscore in R
body: <p>I have a string like &quot;ABC_Something_Filename&quot;. How can I split it into &quot;ABC_Something&quot; and &quot;Filename&quot; in R?</p>
  <p>I do not want to remove anything. I want both components - before and after last underscore.</p>
  <p>Edit: I tried using what's mentioned for columns separation but that is too extensive for my use case. Hence, I finding a regex alternative to simply split a string</p>