c++ - Why doesn't this program run properly under Clang or GCC? -

i'm trying run cppreference's regex_search example:

#include <iostream> #include <string> #include <regex>  int main() {     std::string lines[] = {"roses #ff0000",                            "violets #0000ff",                            "all of base belong you"};      std::regex color_regex("#([a-f0-9]{2})"                         "([a-f0-9]{2})"                         "([a-f0-9]{2})");      (const auto &line : lines) {         std::cout << line << ": "                    << std::regex_search(line, color_regex) << '\n';     }         std::smatch color_match;     (const auto &line : lines) {         std::regex_search(line, color_match, color_regex);         std::cout << "matches '" << line << "'\n";         (size_t = 0; < color_match.size(); ++i)             std::cout << << ": " << color_match[i] << '\n';     }    } 

this program compiles clang++ 3.4-1ubuntu3 , gcc 4.8.2, running gives error:

terminate called after throwing instance of 'std::regex_error'   what():  regex_error aborted (core dumped) 

this question indicated problem 1 gcc, compiling clang produces same problem. explicitly passing in library @ each step command:

clang++ -stdlib=libstdc++ -std=c++11 -h -c regex.cpp -o object.o && clang++ -stdlib=libstdc++ object.o -o regex 

causes error @ runtime, despite fact last lines of first command's output are:

.. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_constants.h .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_error.h .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_cursor.h .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_nfa.h ... /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_nfa.tcc .... /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/regex .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_compiler.h .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_grep_matcher.h ... /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex_grep_matcher.tcc .... /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/regex .. /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/regex.h 

...which indicate appropriate headers present on system.

you still use incomplete gcc standard library implementation, explicitly tell clang use -stdlib=libstdc++.

the standard library implementation comes clang libc++, need -stdlib=libc++ instead.