title: searching a string value in a non-numeric column
body: <p>In the data frame that contains 20000 chess matches, there is a column named <code>opening_name</code>.</p>
  <p>All values in this column are strings like this:</p>
  <pre><code>1        Nimzowitsch Defense: Kennedy Variation
  2         King's Pawn Game: Leonardis Variation
  3        Queen's Pawn Game: Zukertort Variation
  4                              Philidor Defense
                            ...                  
  20053                             Dutch Defense
  20054                              Queen's Pawn
  20055           Queen's Pawn Game: Mason Attack
  20056                              Pirc Defense
  20057           Queen's Pawn Game: Mason Attack
  </code></pre>
  <p>In this column, there are almost a hundred values that have similar names, similar names like <code> Sicilian defence</code> and <code> Sicilian defence: dragon variation</code> I want to access all these values that start with the string <code> Sicilian defence</code>. How can I do that?</p>