def hard_wrap(self):
        self.linebreak = re.compile(r'^ *\n(?!\s*$)')
        self.text = re.compile(
            r'^[\s\S]+?(?=[\\<!\[_*`~]|https?://| *\n|$)'
        )
:param queen_index:
dataset/ETHPy150Open rossant/ipymd/ipymd/lib/markdown.py/InlineGrammar.hard_wrap--crossover with--dataset/ETHPy150Open algorhythms/LeetCode/051 N-Queens II.py/Solution.backtrack