string substring between two characters c++ code example

Example: c++ get string between two characters

string str = "STARTDELIMITER_0_192.168.1.18_STOPDELIMITER";
unsigned first = str.find(STARTDELIMITER);
unsigned last = str.find_last_of(STOPDELIMITER);
string strNew = str.substr (first,last-first);
std::cout << strNew << std::endl;