so far, my night has been extremely frustrating, trying to learn CMake. However, I\'m slowly getting there. There are a couple of things bugging me though:
目录C/C++可以用正则表达式吗？若要判断一个输入的QQ号是否有效，如何判断？正则程序库（regex）正则文法（regex syntaxes）匹配（Match）搜索（Search）替换（Replace）C/C++可以用正则表达式吗？
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