Checking “”


“” is not valid


Checking “123”


“123” is not valid


Checking “123456”


“123456” is not valid


Checking “12a34”


“12a34” is not valid


Checking “12345”


“12345” is valid


Checking “joe”


“joe” is not valid


Checking “34fj1”


“34fj1” is not valid