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#include <iostream>
#include <ostream>
#include <regex>
#include <string>
using namespace std;
 
int main() {
	const regex pattern("([\\w ])(?!\\1)");
	string s = "ssha3akjssss42jj 234444 203488842882387 heeelloooo";
	string result;
 
	for (sregex_iterator i(s.begin(), s.end(), pattern), end; i != end; ++i)
		result.append((*i)[0].str());
 
	cout << result << endl;
 
	return 0;
}

/home/O4H2FI/ccYmd6EM.o: In function `main':
prog.cpp:(.text.startup+0xd5): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator(__gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>, std::basic_regex<char, std::regex_traits<char> > const&, std::bitset<11u>)'
prog.cpp:(.text.startup+0xdd): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::regex_iterator()'
prog.cpp:(.text.startup+0x173): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::operator++()'
prog.cpp:(.text.startup+0x17f): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::operator!=(std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> > const&)'
prog.cpp:(.text.startup+0x18b): undefined reference to `std::regex_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, std::regex_traits<char> >::operator*()'
collect2: error: ld returned 1 exit status

Standard output is empty