how to remove excess lines

[Kevin]

this works
s.findreplace("[][]" "[]")

Code:

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str s=
;dog jump over the fence
;
;
;the cat meows
;
;
;look both ways before crossing
;
;;

out numlines(s)
s.findreplace("[][]" "[]")
out numlines(s)
out s

 this doesn't 
s.findreplace("[] []" "[]")
nor does 
s.findreplace("[][]" "[]" 8)