#include <regex>
#include <string>
#include <iostream>
using namespace std;
 
int main() {
	regex r(R"(foo\s*\([\w, ]*\)\s*\{)");
	string s("int foo () {\n    // Some statement\n}\nint foo(int a, int b){}\nint foo ()\n{\n}");
	for(std::sregex_iterator i = std::sregex_iterator(s.begin(), s.end(), r);
                             i != std::sregex_iterator();
                             ++i)
	{
	    std::smatch m = *i;
	    std::cout <<  m.str() << '\n';
	}
    return 0;
}

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