You say in your question that you want to chage test's to test\'s, but your code is trying to change it to test'/s
Assuming you wanted what you said in the question, you need to escape the '\', because '\' is a special character in Java Strings. Try
@Ronda - this will work because test is a String reference, so the second line actually just points it at the new String and the original String is no longer referenced and so is available for garbage collection.
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