foo.cpp

#include <string>
#include <iostream>
int last_position = 0;
std::string string = "abcdefghijklmnoprstuvwxyz";
std::string match = "jn";
std::string result;
bool end_of_parsing = false;
std::string next(){
    bool end_of_word = false;
    std::string str = "";
    if(last_position == string.length()){
        end_of_parsing = true;
    }
    else{
        bool eqi = false;
        for(unsigned int i = last_position;i < string.length();i++){
            for(unsigned int j = 0;j < match.length();j++){
                if(string[i] == match[j]){
                    if(!end_of_word){
                        end_of_word = true;
                    }
                    else{
                        eqi = true;
                    }
                }
                if(j == (match.length()-1) && !eqi){
                    break;
                }
            }
            if(end_of_word && !eqi){
                break;
            }
            if(!end_of_word)
                str += string[i];
            last_position = i;
        }
        last_position++;
    }
    return str;
}
int main(void){
    do{
        std::cout << next() << std::endl;
    }while(!end_of_parsing);
    return 0;
}