Regex for finding a '?' in a String

Im trying to write a routine to replace the '?' in a String with values
supplied by the client.

ie

String myString = "Hello there, my first name is ? and my surname is
?";
String myRegex = "<a regex>";
myString = myString.replaceFirst(myRegex, "David");
myString = myString.replaceFirst(myRegex, "Bevan");
System.out.println(mString);


Required output is "Hello there, my first name is David and my surname
is Bevan"

What do i need as myRegex?

Many thanks

David Bevan
http://www.davidbevan.co.uk

.