title: Removing words featured in character vector from string
body: <p>I have a character vector of stopwords in R: </p>
  
  <pre><code>stopwords = c("a" ,
              "able" ,
              "about" ,
              "above" ,
              "abst" ,
              "accordance" ,
              ...
              "yourself" ,
              "yourselves" ,
              "you've" ,
              "z" ,
              "zero")
  </code></pre>
  
  <p>Let's say I have the string: </p>
  
  <p><code>str &lt;- c("I have zero a accordance")</code></p>
  
  <p>How can remove my defined stopwords from <code>str</code>?</p>
  
  <p>I think <code>gsub</code> or another <code>grep</code> tool could be a good candidate to pull this off, although other recommendations are welcome. </p>