[JimmXinu]

Originally Posted by ownedbycats

I managed to work this out. x/x and x/? fics get just the first number; x/y fics get both. Please let me know if any improvements to be made:

Well, since you asked...

1. To the best of my knowledge, there's no reason to copy chapterslashtotal to a new entry instead of editing chapterslashtotal.
   But kudos for preemptive paranoia.
   
2. I think it would be slightly cheaper computationally to do:
   

    ao3chaps=>/\?$=>

   IE, just removing the trailing /? rather than also matching number and replacing both with the number. But I doubt you could even measure the difference in normal use.
   
3. I wouldn't use both \1 and \g<1> in the same line. There's no difference in this case and it invites possible future confusion.
   By which I mean, I had to look up \g<1> to be sure it didn't have some additional special meaning.