re.search(r'py$','puppy')返回的是一个Match对象。

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• The world largest search engine company provides a free search service ________ users can get relevant results in an instant.
• Those who are “not-so-great” tend to search for reasons why（）.
• Hill climbing search is sometimes called greedy local search because it grabs a good neighbor state without thinking ahead about
• （） tree search is on the analysis of the most promising moves, expanding the search tree based on random sampling of the search
• There are two approaches to searching for a plan, one is （）　search, and the other is backward relevant-states search.有两种搜索计划的方式，