title: Add a string into identical columns in two dataframe R
body: <p>I have two dataframes (see below) and I would like to add in the first df a string '*' at the end of the identic world for the 2 column &quot;team&quot;  of the different dataframe.</p>
  <pre><code>df &lt;- data.frame(team=rep(c('Blue', 'Red', 'Green', 'Purple', 'Pink'), each=2),
                   pos=rep(c('G', 'F'), times=4),
                   points=round(runif(8, 4, 20),0))
  
  View(df)
  
  df2 &lt;-data.frame(team=rep(c('Blue', 'Purple', 'Pink', 'Yellow'), each=2))
  
  View(df2)
  </code></pre>
  <p>results expected:</p>
  <p><a href="https://i.stack.imgur.com/wkW9S.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wkW9S.png" alt="enter image description here" /></a></p>