title: Delete strings that contain only numbers from the rows of a dataframe
body: <br>
  My dataframe contains many lines consisting of:
  <ul>
  <li><strong>Numbers only;</strong></li>
  <li><strong>Numbers and spaces;</strong></li>
  <li><strong>Strings mixed with numbers (see <em>Hell0 guys34 g00d j0b.</em>);</strong></li>
  </ul>
  <pre><code>+--------------------------+--------+
  |   Content                | Score  |
  +--------------------------+--------+
  | Hello my name is Tim.    | 3      |
  | 081332111333             | 4      |
  | 08 97 5524               | 1      |
  | 10 08 2021               | 1      |
  | Great App                | 3      |
  | Hell0 guys34 g00d j0b.   | 5      |
      . . . . . . . . . .      . . .
  | 122345324 2331 111111    | 3      |
  +--------------------------+--------+
  </code></pre>
  <p>Is there a way to clean up, that is to delete these 3 types of possible rows that appear in my dataframe, using the withColumn, or any other quick method? <br>
  I had created a for loop that iterates over all my rows in the Dataframe, but being <em><strong>over 1 million rows</strong></em>, it takes a long time.
  <em><strong>My environment is Google Colab</strong></em> <br>
  <em><strong>Thanks a lot!!</strong></em></p>