C++/Boost split a string on more than one character

This is probably really simple once I see an example, but how do I generalize boost::tokenizer or boost::split to deal with separators consisting of more than one character? For example, with "__", neither of these standard splitting solutions seems to work : ``` boost::tokenizer<boost::escaped_list_separator<string> > tk(myString, boost::escaped_list_separator<string>("", "____", "\"")); std::vector<string> result; for (string tmpString : tk) { result.push_back(tmpString); } ``` or ``` boost::split(result, myString, "___"); ```