say i have the string "qxq" and i want to repeat the middle char 4 times
i could do this
str = "qxq
newstring = str.gsub(/(x)/, '\1'*4)

but if i have a string full of x's i.e. "xxx"
then it will repeat all of them 4 times and thats not what i want to
do...i just want the middle one to be repeated.

How do i alter that regex to do this???
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