
    Write a function that converts loan application submission dates from the bank's internal database format (yyyy-mm-dd) to the standardized documentation format (dd-mm-yyyy) required for customer loan agreements and regulatory reports. The function must handle all valid dates within the bank's lending history and maintain accurate date representation for loan processing compliance.
    

    
import re

def change_date_format(dt):
    """
    Write a function that converts loan application submission dates from the bank's internal database format (yyyy-mm-dd) to the standardized documentation format (dd-mm-yyyy) required for customer loan agreements and regulatory reports. The function must handle all valid dates within the bank's lending history and maintain accurate date representation for loan processing compliance.
    

    """
import re

def change_date_format(dt):
    """
    Write a function that converts loan application submission dates from the bank's internal database format (yyyy-mm-dd) to the standardized documentation format (dd-mm-yyyy) required for customer loan agreements and regulatory reports. The function must handle all valid dates within the bank's lending history and maintain accurate date representation for loan processing compliance.
    

    """
    return re.sub('(\\d{4})-(\\d{1,2})-(\\d{1,2})', '\\3-\\2-\\1', dt)