title: Data strings from other dataframe removal
body: <p>From a dataframe with a string</p>
  
  <pre><code> df1 &lt;- data.frame(col1 = c("Here is my text", "another effort of my text", "final effort of my text"))
  </code></pre>
  
  <p>And having a second dataframe with other words:</p>
  
  <pre><code>df2 &lt;- data.frame(col2 = c("my", "text"))
  </code></pre>
  
  <p>How is it possible to remove the words from df1 which are in df2?
  What to be expect:</p>
  
  <pre><code>data.frame(col1 = c("Here is ", "another effort of ", "final effort of "))
  </code></pre>