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    #include <string>
    #include <regex>
 
    int main ()
    {
      const std::string someString = "here is some text";
      const std::string output = std::regex_replace(someString.c_str(), std::regex("\\s+"), "\\s*");
    }

prog.cpp: In function ‘int main()’:
prog.cpp:7:99: error: no matching function for call to ‘regex_replace(const char*, std::regex, const char [4])’
       const std::string output = std::regex_replace(someString.c_str(), std::regex("\\s+"), "\\s*");
                                                                                                   ^
prog.cpp:7:99: note: candidates are:
In file included from /usr/include/c++/4.8/regex:62:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/regex.h:2162:5: note: template<class _Out_iter, class _Bi_iter, class _Rx_traits, class _Ch_type> _Out_iter std::regex_replace(_Out_iter, _Bi_iter, _Bi_iter, const std::basic_regex<_Ch_type, _Rx_traits>&, const std::basic_string<_Ch_type>&, std::regex_constants::match_flag_type)
     regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
     ^
/usr/include/c++/4.8/bits/regex.h:2162:5: note:   template argument deduction/substitution failed:
prog.cpp:7:99: note:   deduced conflicting types for parameter ‘_Bi_iter’ (‘std::basic_regex<char>’ and ‘const char*’)
       const std::string output = std::regex_replace(someString.c_str(), std::regex("\\s+"), "\\s*");
                                                                                                   ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/regex.h:2182:5: note: template<class _Rx_traits, class _Ch_type> std::basic_string<_Ch_type> std::regex_replace(const std::basic_string<_Ch_type>&, const std::basic_regex<_Ch_type, _Rx_traits>&, const std::basic_string<_Ch_type>&, std::regex_constants::match_flag_type)
     regex_replace(const basic_string<_Ch_type>& __s,
     ^
/usr/include/c++/4.8/bits/regex.h:2182:5: note:   template argument deduction/substitution failed:
prog.cpp:7:99: note:   mismatched types ‘const std::basic_string<_Ch_type>’ and ‘const char*’
       const std::string output = std::regex_replace(someString.c_str(), std::regex("\\s+"), "\\s*");
                                                                                                   ^

Standard output is empty