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frostming 2018-03-20 22:39:54 +08:00 1
https://docs.python.org/2/library/re.html#re.findall
If one or more groups are present in the pattern, return a list of groups; 如果有分组则返回分组,你这里有分组,但‘ 3 ’没有分组,所以匹配到了 3,仍返回了一个空 |