获取末尾和之前的子串之间的子串

#include <iostream>
#include <string>

std::string getSubstringBetween(std::string str, std::string endSubstr, std::string beforeSubstr) {
    // 找到末尾子串的位置
    size_t endIndex = str.find(endSubstr);
    if (endIndex == std::string::npos) {
        return ""; // 未找到末尾子串，返回空字符串
    }

    // 找到之前子串的位置
    size_t beforeIndex = str.rfind(beforeSubstr);
    if (beforeIndex == std::string::npos) {
        return ""; // 未找到之前子串，返回空字符串
    }

    // 截取两个位置之间的子串
    size_t startIndex = beforeIndex + beforeSubstr.length();
    std::string result = str.substr(startIndex, endIndex - startIndex);

    return result;
}

int main() {
    std::string str = "获取末尾和之前的子串之间的子串";
    std::string endSubstr = "之间";
    std::string beforeSubstr = "末尾和";

    std::string result = getSubstringBetween(str, endSubstr, beforeSubstr);
    std::cout << "获取到的子串为：" << result << std::endl;

    return 0;
}