Question

How to get the substring between two substrings in C++

Answer 1

#include <iostream>
#include <string>

std::string SubstringBetweenTwoSubstrings(const std::string str, 
                                          const std::string suba, 
                                          const std::string subb) {
    size_t posA = str.find(suba);
    size_t posB = str.rfind(subb);

    if (posA == std::string::npos)
        return "";

    if (posB == std::string::npos)
        return "";

    size_t indexEndSuba = posA + suba.length();
    if (indexEndSuba >= posB)
        return "";

    return str.substr(indexEndSuba, posB - indexEndSuba);
}

int main() {
    std::string str = "C#:C C++:Java:Python";

    std::cout << SubstringBetweenTwoSubstrings(str, "C#", "Java") << std::endl;
}



/*
run:

:C C++:

*/

 

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