title: Use string as filter in dplyr?
body: <p>Is there a way to use a string variable as the filter argument in dplyr?  For example:</p>
  
  <pre><code>filter(iris,Sepal.Length &gt; 6)
  </code></pre>
  
  <p>would be replaced with</p>
  
  <pre><code>string &lt;- 'Sepal.Length &gt; 6'
  filter(iris,string)
  </code></pre>
  
  <p>Basically, I am looking for the entire filter string to be a variable as I am creating the filter string pragmatically.  Thanks for any help.</p>