So i sort of found how to do it, but i need 1 more condition i don't think the BRU supports, at least not with significant effort on my part. Here goes how to explain what we have and what we need.
We have 5 types of file(different extensions) all with the same number, multiple sets numbered 1-40. If however we are missing the 20th set, our only option is to rename 21-40 manually. We would then be renaming 95 files by hand.
My solution was BRU, i found using numbering i could get it partially correct using these settings:
Remove** From: 13 to 14
Numbering*** Mode: Insert, at: 14
However the files need to have duplicate numbers based on file extension previously. Here are one set of files below
20100819030001.jpg
20100819030001.jbac
20100819030001.rc
20100819030001.bc
20100819030001.gc
20100819030002.jpg
20100819030002.jbac
20100819030002.rc
20100819030002.gc
20100819030002.bc
However when i use the numbering it disregards the previous naming convetion and i get numbers 1-90. How would i add a restriction to number 1+ based on file extension? I could make a program to loop 5 times renaming... but if i can use this, would be better. The only other option is to use a replace for each string, but once again, still overkill...