std::regex expressions in C++

Question

I am trying to use really straightforward regular expressions to match strings like 2001M12. I create a std::regex object as follows:

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

but I get the following runtime exception on this line:

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

What am I doing wrong?

Answer 1

If you're using gcc, libstdc++ has not yet implemented regex.

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

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Answer 2

maybe your regex string is incorrect and try this "^\d{4}M\d{2}$".