Regex in C++: Requires compiler support error

Question

I'm trying to use regex in C++. The following is my code:

#include<iostream>
#include<stdlib.h>
#include<string.h>
#include<regex>
using namespace std;

int main(int argc, char** argv) {
    string A = "Hello!";
    regex pattern = "(H)(.*)";
    if (regex_match(A, pattern)) {
        cout << "It worked!";
    }
    return 0;
}

But I'm encountering this error :

In file included from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/regex:35:0,
                 from main.cpp:12:
/usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/bits/c++0x_warning.h:31:2: error: #error This file requires compiler and library support for the upcoming ISO C++ standard, C++0x. This support is currently experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.

How can this be solved and what is wrong?

Perhaps dup to stackoverflow.com/questions/4716680/c0x-regex-in-gcc — ZhangChn
– ZhangChn, Commented Dec 12, 2012 at 9:48

hmjd · Accepted Answer · 2012-12-12 09:45:20Z

6

and must be enabled with the -std=c++0x or -std=gnu++0x compiler options

Add one of those options, -std=c++0x or -std=gnu++0x, to your compiler command:

g++ -std=c++0x ...

Note if std::regex is not supported see boost::regex for an alternative.

answered Dec 12, 2012 at 9:45

hmjd

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4 Comments

Enigman Over a year ago

How exactly do I do that? Thanks!

Enigman Over a year ago

Oh. I'm not using the terminal to compile and run my code. I'm using netbeans.

hmjd Over a year ago

@Enigman, I don't use NetBeans. Google for how to add compiler options in NetBeans or search the NetBeans manual should provide you with a solution.

Enigman Over a year ago

Yeah. I shouldn't have asked that here! Sorry. Will do that.

Tom Macdonald · Accepted Answer · 2012-12-12 10:07:51Z

2

It looks like you are trying to use the regex class, which is part of the new C++11 standard, but not telling the compiler to compile to that standard.

Add -std=c++0x to your compiler flags and try again.

EDIT : As the gcc implementation status page shows, the regex support in gcc is far from complete. So even adding the right flag wont help yet. If you need regex support, you could try boost.

edited Dec 12, 2012 at 10:07

answered Dec 12, 2012 at 9:46

Tom Macdonald

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5 Comments

Enigman Over a year ago

How do I add it to my 'compiler flags?' I'm using NetBeans. Is there an option here that lets me do that?

Tom Macdonald Over a year ago

project properties -> Build -> C++ Compiler -> Additional Options I believe.

Enigman Over a year ago

I've done that. Still there seems to be error. :( I tried the code given at cplusplus.com/reference/regex/regex_match too.

Tom Macdonald Over a year ago

See my edit. Regex support in the gcc C++11 implementation is not complete.

Pete Becker Over a year ago

@Enigman - don't bother. GCC's implementation of regular expressions is unusable.

Artjom B. · Accepted Answer · 2015-09-29 16:01:38Z

2

Simply just add

g++ -std=gnu++0x <filename.cpp>

or

g++ -std=c++0x <filename.cpp>

It will work properly

edited Sep 29, 2015 at 16:01

Artjom B.

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answered Sep 29, 2015 at 11:42

abhisek

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