Return position of end of cell marker, and position of first line after cell

def find_cell_end(self, lines):
        """Return position of end of cell marker, and position of first line after cell"""
        if self.metadata is None and not (self.cell_marker_end and self.end_code_re.match(lines[0])) \
                and paragraph_is_fully_commented(lines, self.comment, self.default_language):
            self.cell_type = 'markdown'
            for i, line in enumerate(lines):
                if _BLANK_LINE.match(line):
                    return i, i + 1, False
            return len(lines), len(lines), False

        if self.metadata is None:
            self.end_code_re = None
        elif not self.cell_marker_end:
            end_of_cell = self.metadata.get('endofcell', '-')
            self.end_code_re = re.compile('^' + self.comment + ' ' + end_of_cell + r'\s*$')

        return self.find_region_end(lines)