User Name Rule:

1. Contains a minimum of 5 characters and a maximum of 30;

2. Contains only alphanumeric characters(a-z\,A-Z\,0-9);

3. Can not contain any special characters except "_", which only in the middle of the user name;

4. Can not contain space.

Password Rule:

1. Contains a minimum of 8 characters and a maximum of 32;

2. At least contains: one uppercase letter(A-Z), one lowercase letter(a-z), and one digit(0-9), one special character: ~`@#$%^&*-_=+|?/()<>[]{}",.;'!

3. Can not contain any the user name or user name in reverse order;

4. Can not contain space.