In [29]: re.findall("([abc])+","abc")
Out[29]: ['c']
In [30]: re.findall("[abc]+","abc")
Out[30]: ['abc']
In [29]: re.findall("([abc])+","abc")
Out[29]:
阅读背景：
两个正则表达式之间的区别:[abc]+和([abc])+
来源：互联网
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