Regex

[Olysold]

The following code is straight off the pages of C++ Primer and flat out doesn't work. The error it throws is just simply 'std::regex_error'

#include<iostream>
using std::cout; using std::endl;

#include<string>
using std::string;

#include<regex>
using std::regex;
using std::smatch;

int main()
{
    string pattern("[^c]ei");
    pattern = "[[:alpha:]]*" + pattern + "[[:alpha:]]*";

    regex r(pattern);
    smatch results;

    string test_str = "recepit freind theif receive";

    if (regex_search(test_str, results, r))
        cout << results.str() << endl;

}

What could be the problem? I'm assuming it has to do with compiler/IDE. I'm using Code::Blocks that comes with the latest MingW. I think its' using gcc 4.7.1.

[JLBorges]

> What could be the problem?

libstdc++ has not implemented regular expressions.

C++11 support in libstdc++ is woefully incomplete.
http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011
(grey and red all aound the place; regex is section 28)

It would have been better if spurious headers were not shipped with the library; at least some one would know immediately that <regex> just isn't there.

Use boost regex instead.

[Olysold]

And to think an update is coming up next year. Thanks for the solution =).