Compile std::regex_iterator with gcc

Question

I can create .o file with g++ -c test.cpp -std=c++0x, but cant link it, got next errors:

test.cpp:(.text+0xe5): undefined reference to `std::regex_iterator<char const*, char, std::regex_traits<char> >::regex_iterator(char const*, char const*, std::basic_regex<char, std::regex_traits<char> > const&, std::bitset<11u>)'
test.cpp:(.text+0xf1): undefined reference to `std::regex_iterator<char const*, char, std::regex_traits<char> >::regex_iterator()'

Code:

#include <regex> 
#include <iostream> 

#include <string.h>

typedef std::regex_iterator<const char *> Myiter; 
int main() 
{ 
    const char *pat = "axayaz"; 
    Myiter::regex_type rx("a"); 
    Myiter next(pat, pat + strlen(pat), rx); 
    Myiter end; 


    return (0); 
}

Which version of GCC? <regex> isn't actually implemented up to and inluding 4.6.2. Also, why not use std::cregex_iterator instead? — Kerrek SB
– Kerrek SB, Commented Dec 19, 2011 at 13:14
have you considered using the boost regex libraries? Both boost::regex and boost::xpressive are fully functional. — mark
– mark, Commented Dec 19, 2011 at 15:05
This might help someone: Don't be fooled if you think you have a regex implementation in gcc 4.7.1. Look closely at the content of regex.h and you'll see it full of TODO entries and unimplemented functions. — doug65536
– doug65536, Commented Jan 30, 2013 at 20:59

tshepang · Accepted Answer · 2014-10-13 05:43:26Z

17

The GNU C++ standard library supports <regex>, but not until version 4.9.0. (The headers were present in earlier versions, but were unusable.)

The other compilers don't support it, as far as I can see.

You can use a different library if you use an older GCC.

edited Oct 13, 2014 at 5:43

tshepang

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answered Jan 18, 2012 at 16:30

spraff

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1 Comment

Arzar Over a year ago

Both MSVC and Clang support <regex>. Actually regex is pretty much the only part of C++11 where GCC lags behind other compilers.

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