def detect_function_style(self, test_record):
        """Returns the index for the function declaration style detected in the given string
           or None if no function declarations are detected."""
        index = 0
        # IMPORTANT: apply regex sequentially and stop on the first match:
        for regex in FUNCTION_STYLE_REGEX:
            if re.search(regex, test_record):
                return index
            index+=1
        return None
Returns the index for the function declaration style detected in the given string
           or None if no function declarations are detected.