regrules.py

def check_username(username):
    from TCGServer import read_usernames
    #username length between 4 and 16
    #username cannot contain symbols
    #must not be taken
    faults = []
    if not 4 < len(username) < 16:
        faults.append('too long\short')
    if not username.isalnum():
        faults.append('can only contain alphanumeric characters')
    return faults

def check_password(password):
    #password length between 8 and 32
    #password must have at least 1 number and 1 letter
    #password cannot contain symbols
    faults = []
    if not 8 <= len(password) <= 32:
        faults.append('too long\short')
    if not password.isalnum():
        faults.append('can only contain alphanumeric characters')
    if password.isalpha() or password.isnumeric():
        faults.append('must have at least 1 letter and number')
    return faults

def check_email(email):
    #must look like an email. If they don't get email it is because they entered wrong.
    if '@' not in email:
        return ('invalid email')
    uname, domain = email.split('@')
    if '.' not in domain:
        return ('invalid email')
    domain, ext = domain.split('.')
    if len(domain) < 2 or len(ext) <= 1:
        return ('invalid email')
    return True