#include <iostream>
#include <regex>
#include <string>
using namespace std;

int main() {
	regex rex(R"(([\s\S]*)<FooBar>)");
	string s("abcde\n		fghij<FooBar>");
	smatch m;
	if (regex_search(s, m, rex)) {
		std::cout << m.str(1) << std::endl;
	}
	return 0;
}