C ++中的std :: regex表达式

Question

我正在尝试使用非常简单的正则表达式来匹配2001M12之类的字符串。我创建了一个std::regex对象，如下所示：

std::regex gretlMonth("^[:d:]{4}M[:d:]{2}$");

但是我在这一行得到了以下运行时异常：

unknown location(0): fatal error in "Plot_GuessesTimeFormat": std::runtime_error: regex_error

我做错了什么？

Answer 1

如果您正在使用gcc，则libstdc ++尚未实现正则表达式。

http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011

另见：

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Answer 2

也许你的正则表达式字符串不正确并试试这个“^ \ d {4} M \ d {2} $”。