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
construct a regular expression to validate a string of 8 to 30 alphanumeric characters.
user
^(?=.*[a-za-z])(?=.*\d)[a-za-z\d]{8,30}$
assistant