title: How to replace forward slashes with backslashes in a string in Emacs Lisp?
body: <p>I would like to replace forward slaches to backslashes in emacs lisp. 
  If I use this : </p>
  
  <pre><code>(replace-regexp-in-string "\/" "\\" path))
  </code></pre>
  
  <p>I get an error.  </p>
  
  <pre><code>(error "Invalid use of `\\' in replacement text")
  </code></pre>
  
  <p>So how to represent the backslash in the second regexp?</p>