CODEWITHSUNDEEP
c#c++c
Eduardo Spaki
Eduardo Spaki

Reputation: 1188

how to convert regex code in C# to c++

I have this code in C#:

string data = "something ... 1,000 anything 20,000 other thing...";
string pattern = @"[0-9]+([\,|\.][0-9]{1,})*([\.\,][0-9]{1,})?";

MatchCollection collection = Regex.Matches(data, pattern);

foreach (Match item in collection)
{
    Console.WriteLine("{0} - {1} - {2}", item.Value, item.Index, item.Length);
}

Console.WriteLine();
Console.WriteLine("End!");
Console.ReadKey();

... and I tried to convert it in C++ (native code, without .net assemblies), so I get something like this:

void main()
    {
        string data = "something ... 1,000 anything 20,000 other thing...";
        regex pattern("([0-9]+([\\,|\\.][0-9]{1,})*([\\.\\,][0-9]{1,})?)");


        const sregex_token_iterator end;

        for (sregex_token_iterator i(data.begin(), data.end(), pattern); i != end; ++i)
        {
            std::cout << i->str() << "-" << i->length() << std::endl;
        }

        cout << endl << "End!";
        fflush(stdin); 
        getchar(); 
    }

So, how can I get the index of the match?

Upvotes: 0

Views: 1183

Answers (2)

Eduardo Spaki
Eduardo Spaki

Reputation: 1188

I solved this way:

struct MatchInfo
{
    string value;
    int index;
    int length;
};

vector<MatchInfo> DoRegex(string data, string pattern)
{
    regex patternRegex(pattern);
    sregex_token_iterator end;
    vector<MatchInfo> result;

    for (sregex_token_iterator i(data.begin(), data.end(), patternRegex); i != end; ++i)
    {
        MatchInfo item;

        item.index = i->first - data.begin();
        item.length = i->length();
        item.value = i->str();

        result.push_back(item);
    }

    return result;
}

Upvotes: 0

Stack Overflow is garbage
Stack Overflow is garbage

Reputation: 247969

Depending on your compiler, the <regex> header might be available, in which case you can simply rewrite the regular expression using the C++ API, which should be trivial.

If that's not available, <tr1/regex> might be available, or failing that, you can use teh Boost.Regex third party lib.

Upvotes: 5

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