Re: Named Group support for regular expressions in TR1?

From:

mlimber <mlimber@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Tue, 12 Aug 2008 06:15:25 -0700 (PDT)

Message-ID:

<2879d027-a530-44ee-bd34-db7866fa8240@m45g2000hsb.googlegroups.com>

On Aug 11, 7:04 pm, DomoC...@gmail.com wrote:

On Aug 11, 8:59 am, mlimber <mlim...@gmail.com> wrote:

On Aug 10, 5:21 pm, DomoC...@gmail.com wrote:

When I attempt to name a group in a regular expression under TR1, the
library throws a non descriptive error "regular expression error".
The numbered reference group works, as in /1 to reference the first
group. However, any attempt to use (?<myGroup>expression) fails?

Does anyone have any insight into this?

How about minimal but complete code (and input) to reproduce the
problem? Compare this FAQ on posting non-working code:

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

Cheers! --M

Certainly...

// Compiler Information
Version 9.0.21022.8 RTM
Microsoft .NET Framework
Version 3.5
Installed Edition: Enterprise
Microsoft Visual C++ 2008 91899-153-0000007-60443
// Operating System
Windows Vista

#include <string>
using std::string;

// This example should be compiled with visual studio 2008, with the
TR1 update
// TR1 Update Link :http://www.microsoft.com/downloads/details.aspx?Famil=

yId=D466226B-8DA...

#include <regex>
using namespace std::tr1;

int main(int argc, char* argv[])
{
        try
        {
                // this works
                regex pattern1( "<[\\?](.+)[\\?]>?" );
                // this fails
                regex pattern2( "<[\\?](?'groupName'.+)[\=

\?]>?" );

// so does this
regex pattern3( "<[\\?](?<groupName>.+)[\=

\?]>?" );

        }
        catch (std::exception& exc)
        {
                // shows up as "regular expression error"=

, "unknown (?'groupName')

would have been nice :/ oh well
                string dbg = exc.what();
        }

        return 0;

}

Looking at the Dinkumware documentation, I don't see support for named
groups in the RE grammar.

http://www.dinkumware.com/manuals/default.aspx?manual=compleat&page=lib=
_regex.html

Am I missing something?

Cheers! --M