<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_snake_case(text):
 """Convert to snake case. :param str text: :rtype: str :return: """

    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', text)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()