title: replace text within parenthesis in R
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/8621066/remove-text-inside-brackets-parens-and-or-braces">Remove text inside brackets, parens, and/or braces</a>  </p>
  </blockquote>
  
  
  
  <p>I would like to replace the parenthesis and the text between parenthesis in a large text file. </p>
  
  <p>Example input (content in the text file): </p>
  
  <pre><code>Keep me (Remove Me 1). Again keep me (Remove Me 2). Again again keep me (Remove Me 3).
  </code></pre>
  
  <p>Output (content in a new text file): </p>
  
  <pre><code>Keep me. Again keep me. Again again keep me. 
  </code></pre>
  
  <p>Is it possible to do this in R (say using grep)?</p>