Re: [boost] [config] std::regex unusable on gcc?

Subject: Re: [boost] [config] std::regex unusable on gcc?
From: Brian Ravnsgaard Riis (brian_at_[hidden])
Date: 2014-03-22 12:22:16

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On 2014-03-22 17:00, Andrey Semashev wrote:
> Hi,
> 
> I'm trying to use std::regex and it's failing with even the
> simplest patterns:
> 
> #include <regex>
> 
> int main(int, char* argv[]) { std::regex rex("\\d"); return
> std::regex_match("1", rex); }
> 
> g++ -std=c++11 rex_test.cpp -o rex_test ./rex_test terminate called
> after throwing an instance of 'std::regex_error' what():
> regex_error Aborted (core dumped)
> 
> GCC version: gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu9). GCC
> 4.7.3 exhibits the same behavior.
> 
> Replacing "\\d" pattern with "[0-9]" results in the same failure.
> It works with Boost.Regex, Boost.Xpressive and with clang 3.4 &
> libc++. Am I doing something wrong?
> 
> If my use of std::regex is correct then for me this basically means
> that std::regex is unusable. In this case, could we define
> BOOST_NO_CXX11_HDR_REGEX in Boost.Config for all versions of
> libstdc++?

The regex implementation in gcc's libstdc++ up to 4.8.x is incomplete.
To say the least! Rumour has it it'll be available in 4.9. Previous
versions implemented enough interface to compile, but it will not
actually work.

Stick with boost until 4.9 is available.

 /Brian
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