Regular expressions both baffle and scare me, so I thought I'd best throw this out to the experts.

I create a large monthly emailer and the client insists on a unique tracking code on each link.

This is the tracking code


So I append a letter to this until I reach Z then I start the alphabet again but then append a 1





And the margin for *ahem* human error is huge as there are a lot of links. Assuming the tracking codes are already in place is there a way to append these links sequentially with RegEx?

Hope so!