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 that matches any 7 digit number.
user
the regular expression for any 7 digit number is `\d{7}`. this will match any 7 digits in a row.
assistant