title: Remove numbers from string in dataframe in R
body: <p>Is there a way to remove numbers from strings in a column</p>
  <pre><code>ColA   ColB
  A.12    dff
  B.34    dfa
  C.545   dfd
  </code></pre>
  <p>Expected output</p>
  <pre><code>ColA   ColB
  A      dff
  B      dfa
  C      dfd
  </code></pre>