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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 _handleSmsReceived(self, notificationLine):
 """ Handler for "new SMS" unsolicited notification line """

        self.log.debug('SMS message received')
        cmtiMatch = self.CMTI_REGEX.match(notificationLine)
        if cmtiMatch:
            msgMemory = cmtiMatch.group(1)
            msgIndex = cmtiMatch.group(2)
            sms = self.readStoredSms(msgIndex, msgMemory)
            self.deleteStoredSms(msgIndex)
            self.smsReceivedCallback(sms)