title: Match each comma separated string in R dataframe with values in another df
body: <p>Problem: I need to match comma separated strings in one data frame with another that has some values. My final dataframe should place the highest those values in the first dataframe. I have showed that as an example. I'm new to R and I'm unable to find logic to build this code. I'd appreciate if I can get some help in getting started.</p>
  
  <p>Two DFs</p>
  
  <pre><code>DF1: 
  Fruits
  Guava
  Mango, apple, banana
  Apricot, plum
  Avocado, Cherry, blueberry, raspberry
  
  DF2:
  
  Fruits Price   
  Guava    10 
  Mango    30 
  Apple    25 
  Banana   15              
  Apricot  40  
  Plum     35   
  Avocado  120   
  Cherry   23    
  Blueberry 200 
  Raspberry 125
  </code></pre>
  
  <p>Output DF3 : Should create a new column "highest price" and place the highest price across the group of fruits in DF1</p>
  
  <pre><code>DF3: 
  Fruits Highest Price
  Guava    10
  Mango, apple, banana 30
  Apricot, plum  40
  Avocado, Cherry, blueberry, raspberry 200
  </code></pre>