; You need to include ?: in all _mobnames parans to escape capture to the expected () for counting mobs
; Make sure it's "?:" and not ":?"!!

; Two examples:

/alias chinch tochinch%;/set abag 1%;/repeat -2 1 /stepper chinch
/alias chinch-h fromchinch
/set chinch_mobnames A (?:Baby|Young|Adult|Mature) Chinchilla
/set chinch_killname chinchilla
/set chinch_path e e e e e n w w w w w n e e e e e n w w w w w n e e e e e n w w w w w s s s s s 

/alias checkers tocheckers%;/set abag 1%;/repeat -2 1 /stepper checkers
/alias checkers-h fromcheckers
/set checkers_mobnames (?:A [a-z]+ chinese checker)
;/set checkers_mobnames (?:A (?:red|blue) chinese checker)
/set checkers_killname checker
/set checkers_path ne ne ne se ne se nw nw ne ne sw nw sw sw sw sw sw nw ne ne ne ne nw sw sw sw sw sw nw sw ne ne ne ne ne ne sw sw sw nw sw nw se se se se se se