create a WIKI like "diff" between two strings

Question

i am generating a report showing the different between fields before and after. I have it working but some of the fields are pretty long and the changes are quite subtle. I want some visualization to highlight what has changed.

Similar to what you see in:

1. Stackoverflow if you look at question edits
2. One of the text file diff tools when you compare checked in code with older versions.

Answer 1

This one has worked pretty well for me in my projects.