[Boost-users] [string_algo] split algorithm predicate question

I've used the boost::algorithm::split successfully in the past with the is_any_of predicate as shown in the docs. Something like: using namespace boost_algorithm; std::vector<std::string> split_result; split( split_result, some_string, is_any_of("=+") ); But now I want to match a multi char string exactly on the split. Effectively something like: std::string some_data("1===2); split( split_result, some_data, is_equal("===") ); //result gets strings "1","2" I'm not finding a predicate or easy way to do this. Is this not supported or am I just missing something? Thx, Jeff