JavaScript RegEx double name

Question

I want to only allow one capital letter at start, and one more if(after hyphen) and that your able to write only one hyphen, so that u can write a double name, like Klas-Bertil and nothing else.

Shall allow:

Klas
Klas-Bertil
Fredrick-Patrick

not:

KlAs-
KLaS-bErtIl
Fre-Dr-IckP-aTrick

Dont know if im making myself understood? :)

Thanks in advance!

Answer 1

try this:

^[A-Z]?[a-z]*(?:-[A-Z][a-z]*)?$

if you'd like to force capital letter at the start:

^[A-Z][a-z]*(?:-[A-Z][a-z]*)?$