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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 search(self, buf):
 """Search the provided buffer for a match to the object's regex. Search the provided buffer for a match to the object's regex. If the *match* is found, returns a :class:`RegexMatch` object, otherwise returns ``None``. :param buf: Buffer to search for a match. :return: :class:`RegexMatch` if matched, None if no match was found. """

        match = self._regex.search(self._check_type(buf))
        if match is not None:
            start = match.start()
            end = match.end()
            return RegexMatch(self, buf[start:end], start, end, match.groups())