stdstring - C++ Multiple delimiters with more than one char -

in c++, i'm having trouble coding multiple delimiters single char delimiters , string delimiters (e.g. "<=" delimiter opposed '='). code below works single char delimiters (i've set delimiters space, comma, dot, plus , equal) , separates words in string line nicely. however, don't know how add string delimiters code.

std::string delimiters = " ,.+=";//i want "<=" added single delimiter std::string line = "this+is,a.string=testing one"; std::size_t prev = 0, pos; while ((pos = line.find_first_of(delimiters, prev)) != std::string::npos) {     if (pos > prev)     {         cout << line.substr(prev, pos-prev) << endl;         prev = pos + 1;     } } if (prev < line.length()){     cout << line.substr(prev, std::string::npos) << endl; } 

here 1 way erasing delimiters find line_copy string, having special if statement special delimiter. full example here:

auto pos = find_first_of(begin(line_copy), end(line_copy), begin(delimiters),                           end(delimiters));  while (pos != line_copy.end()) {     if (pos != line_copy.end()) {         if (*pos == '<' && *(pos + 1) == '=') {             cout << "delimiter: \'";             cout << string(pos, pos + 2) << "\'" << endl;              // remove delimiters copy string             line_copy.erase(pos, pos + 2);         }         else {             cout << "delimiter: \'" << *pos << "\'" << endl;              // remove delimiters copy string             line_copy.erase(pos, pos + 1);         }     }     cout << endl;      pos = find_first_of(begin(line_copy), end(line_copy), begin(delimiters),                          end(delimiters)); }