Username must be at least 5 character long.

Password must be at least 8 digit long, and
1. must contain at least 1 digit, 0-9.
2. must contain at least 1 uppercase letter, A-Z.
3. must contain at least 1 lowercase letter, a-z.
4. must contain at least 1 symbol ~!@#$%^&*()_+{}\":;'[]