title: Removing/replacing brackets from R string using gsub
body: <p>I want to remove or replace brackets "(" or ")" from my string using gsub. However as shown below it is not working. What could be the reason?</p>
  
  <pre><code> &gt;  k&lt;-"(abc)"
   &gt;  t&lt;-gsub("()","",k)
   &gt;  t 
  [1] "(abc)"
  </code></pre>