Question

It would work something like this

someUtility.replace ("Hello, my name is {1}.  What is your {2}?", "Mark", "name");

Answer 1

String.format("Hello, my name is %1$s.  What is your %2$s?", "Mark", "name");

or if you will just use each once in order:

String.format("Hello, my name is %s.  What is your %s?", "Mark", "name");