def my_validate(value):
    if len(value) < 1 or len(value) > 256:
        print(valeu + " Must be between 1-255")
    if any(not l.isalnum() and l not in ['_', '/'] for l in value):
        print(value + " Must be all alphanumeric or contain _ or /")


my_validate("sd434_/")
my_validate("sd434_/()")