Regex C Help on escape character - c++

Question

I am having trouble extracting the token values from my string : "JOIN #ROOM\r\n"
I am compiling my code on Mingw64 with the following arguments : g++ tregex.cpp -o tregex.exe -std=gnu++11
I get this error , but not my exception for some reason :
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
terminate called after throwing an instance of 'std::regex_error'
what(): regex_error
This is my code :
#include <regex>
#include <string>
#include <iostream>
using namespace std;
//Tregex.cpp
int main(void) {
regex rgx("[[:cntrl:]]");
string str = "JOIN #ROOM\r\n";
smatch match;
try{
if(regex_search(str, match, rgx))
for(auto token:match) cout << token <<"\n";
cout<< endl;
}
catch(regex_error & e){
if( e.code() == regex_constants::error_escape )
cerr << "invalid escape character \n";
else if( e.code() == regex_constants::error_stack )
cerr << "regular expression is not big enough\n";
else
cerr << "exception caught: "<< e.what()<<"\n";
}
cin.get();
return 0;
}

Answer 1

FWIW, there's nothing wrong with your C++ code, and it works perfectly using Clang and libc++ on my MacBook.
As indicated by the comments above, <regex> is one of the features that works in the LLVM project's libc++ but has never worked properly in the GNU project's libstdc++. You might try switching to libc++ if it's available for your platform.