Regex to check if the first character is uppercase

Question

I\'m trying to check that the first character of a username is capital, the following can be letters or numbers and at most 20 characters long. Can someone explain why my synta

Answer 1

Why can't you let the poor users pick their own usernames? What you should do is convert all caps to lowercase.

"User Name".toLowerCase();

---

But if you are truly evil, you should change that z to a Z:

/^[A-Z][A-Za-z0-9_-]{3,19}$/