I have a problem which I am battling to solve. I am wondering if someone has done something similar:

I have several documents which contain strings such as:
1. Word$n:m (n and m being one, two or three digit numbers)
2. Word$n (as above)
3. x$Word$n:m (x = 1, 2 or 3)
4. x$Word$n (x = 1, 2 or 3)

Word being any word appearing in an array of words. The words are case sensitive.
$ = a non-breaking space

As each occurrence is found I need to replace the non-breaking space with a normal space.

Thank you in advance for any assistance.