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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_snake_case(camel_case_string):
 """ Convert a string from camel case to snake case. From example, "someVar" would become "some_var". :param camel_case_string: Camel-cased string to convert to snake case. :return: Snake-cased version of camel_case_string. """

    first_pass = _first_camel_case_regex.sub(r'\1_\2', camel_case_string)
    return _second_camel_case_regex.sub(r'\1_\2', first_pass).lower()