But your current regular expression does not allow for a leading ' or for multiple parts of the last name, delimited by whitespace.
Maybe you can write a short, self-contained program that shows what regular expression you are currently using, and how, and also has some input data that you want to match and some input data that you want to reject.
As I've tried to hint with my examples, names are much more complicated than your current approach allows, so I guess the best approach is to allow almost anything as a name.
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