测试了一下，发现两者输出都是相同的，谢谢
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rabbbitSep 5, 2017
1
print(re.search('(\d)\d\d', '123').group())
print(re.search('(\d)\d\d', '123').group(0)) print(re.search('(\d)\d\d', '123').group(1)) |
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2
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1 |
3
without arguments，group1 defaults to zero （ the whole match is retrun ）。
就在官方文档里 |
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