There's a list of "references" with links to other patents. I don't know if this patents references them, or vice versa. But one of them is case-insensitive matching:

http://www.freepatentsonline.com/6675354.html

I just noticed, this is an IBM patent. What are they playing at.

Here's the flowchart for this "invention":

http://www.freepatentsonline.com/6675354-0-large.jpg