Named Group support for regular expressions in TR1?

[DomoChan@gmail.com]

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>expr ession) fails?

Does anyone have any insight into this?

Thanks!
-Velik

[mlimber]

Re: Named Group support for regular expressions in TR1?

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>expr ession) 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

[DomoChan@gmail.com]

Re: Named Group support for regular expressions in TR1?

On Aug 11, 8:59 am, mlimber <mlim...@gmail. comwrote:

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>expr ession) 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?FamilyId=D466226B-8DAB-445F-A7B4-448B326C48E7&displaylang=en

#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;
}

[mlimber]

Re: Named Group support for regular expressions in TR1?

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

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

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>expr ession) 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-lit...t.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/d...d=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

[Pete Becker]

Re: Named Group support for regular expressions in TR1?

On 2008-08-10 17:21:17 -0400, DomoChan@gmail. com said:

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>expr ession) fails?
>

Named groups are not part of regular expressions in TR1 nor in C++0x.

--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)