1.問題/需求
在含有多行文字的英文段落或一篇英文中查找匹配含有關鍵字的句子，
例如在以下字串：
text = '''Today I registered my personal blog in the cnblogs and wrote my first essay. The main problem of this essay is to use python regular expression matching to filter out sentences containing keywords in the paper. To solve this problem, I made many attempts and finally found a regular expression matching method that could meet the requirements through testing. So I've documented the problem and the solution in this blog post and shared it for reference to others who are having the same problem. At the same time, this text is also used to test the feasibility of this matching approach. Some additional related thoughts and ideas will be added to this blog later.'''
中匹配含有’blog‘的句子，
2.解決方法
因為要找出所有含有關鍵字的句子，所以這里采用re庫中findall()方法，同時，由于所搜索的字串中含有換行符'\n'，因此向re.compilel()傳入re.DOTALL引數，以使'.'字符能夠匹配所有字符，包括換行符'\n'，這樣我們匹配創建Pattern物件為：
newre = re.compile('[A-Z][^.]*blog[^.]*[.]', re.DOTALL)
newre.findall(text) # 進行匹配
# 結果為：
['Today I registered my personal blog in the cnblogs and wrote my first essay.',
"So I've documented the problem and the solution in this blog post and \nshared it for reference to others who are having the same problem.",
'Some additional \nrelated thoughts and ideas will be added to this blog later.'] # 這其中的'\n'就是換行符, 它在字串中是不顯示的, 但是匹配結果中又顯示出來了
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