Checking file extensions

Shell Programming and Scripting
1

I'm in csh and have a list of file names, example

set Lst = "file1.ry file2.ry file3.ry file4.ry"

I want to check if all the extensions are ry. Is they are, I want to do something.

2 
case $Lst in
    *.ry ) Do something here;
    ;;
    * ) exit
    ;;
esac