character class in c++ regex is not working properly

Question

Below program output is "It is not matching" but ideally it should be "It is matching" ?

#include <iostream>
#include <string>
#include <regex>

using namespace std;
using namespace regex_constants;

int main()

{
    string pattern = "[a]*";
    try {
        regex re(pattern, extended);
        if(regex_match("aaaa", re))
           cout << "It is matching" << endl;
        else
           cout << "It is not matching" << endl; 
    }catch(regex_error &e)
    {
       cout << e.what() << endl;
    }
    return 0;
}

Does it work if you use the default grammar instead of `extended`? — Ben Jackson, Apr 29 '13 at 07:54

score 0 · Answer 1 · answered May 09 '13 at 15:30

0

Try compiling with Clang

clang++ -std=c++0x -stdlib=libc++ yourfile.cpp

Clang (3.3) supports regexes, GCC doesn't yet.

answered May 09 '13 at 15:30

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character class in c++ regex is not working properly

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