Shell script - Case

I am trying to use pattern matching in case under shell script but I am getting some problem.

I want to perform some action having filename as : [s-z]*.pbrt

but when I am writing

case "$file" in
[s-z]*.pbrt) echo "Successful"
;;
*) ;;
esac

its not working. Can somebody help me out?
Well, as this is a C/C++ forum, probably not.
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