title: Replace last occurrence of character in string
body: <p>I've got the following string : </p>
  
  <p>01/01/2014 blbalbalbalba blabla/blabla</p>
  
  <p>I would like to replace the last slash with a space, and keep the first 2 slashes in the date.</p>
  
  <p>The closest thing I have come up with was this kind of thing :</p>
  
  <pre><code>PS E:\&gt; [regex] $regex = '[a-z]'
  PS E:\&gt; $regex.Replace('abcde', 'X', 3)
  XXXde
  </code></pre>
  
  <p>but I don't know how to start from the end of the line. Any help would be greatly appreciated.</p>
  
  <p>Editing my question to clarify : 
  I just want to replace the last slash character with a space character, therefore : </p>
  
  <p>01/01/2014 blbalbalbalba blabla/blabla
  becomes
  01/01/2014 blbalbalbalba blabla blabla</p>
  
  <p>Knowing that the length of "blabla" varies from one line to the other and the slash character could be anywhere.</p>
  
  <p>Thanks :)</p>