title: Position of character to the left of current position in string
body: <p>From some arbitrary position in a string I need to find the closest position of a character to the left of my position. If I want to perform this operation to the right I could just use <code>.IndexOf</code>, but how to do it to the left I am unsure. </p>
  
  <p>The two ways I came up with were just a decrementing loop starting at my position or, putting the string in reverse and using a normal <code>.IndexOf</code></p>
  
  <p>Anyone else have any better ways of achieving this?</p>