as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
describe the characteristics of a valid email address.
user
a valid email address should contain a username, an @ symbol, a domain followed by a valid domain name suffix (ex. com, edu, org, etc), and sometimes a subdomain name (ex. www). it should also be between 3 and 254 characters in length and contain only alphanumeric characters, periods, hyphens and underscores.
assistant