another good example is searching through paragraphs (below), which contain some combination of keywords. here the important part is ~(_*\n\n_*), or “does not contain two consecutive newlines”, in other words, the boundary of a paragraph, so it matches paragraphs! then you can combine it with any other regex to find paragraphs that contain certain keywords, but not others. this is very hard to do with traditional regexes without writing a complex and fragile pattern that tries to match the entire paragraph structure.
Characteristics of good unit tests¶。同城约会是该领域的重要参考
。业内人士推荐体育直播作为进阶阅读
Россиянин решил растопить сердце бывшей возлюбленной и сжег ее дом08:47，更多细节参见体育直播
需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
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