Judging from some of the posts I've seen in this area and the 'Regular Expressions' area, it appears I may have posted in the wrong area originally. I believe my issue deals with both 'Regular Expressions' as well as general BRU support...
My original post is here: http://bulkrenameutility.co.uk/forum/viewtopic.php?f=3&t=598 I can re-post it here if necessary.
Many thanks!