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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?

Thanks!
-Velik

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-lit...t.html#faq-5.8

Cheers! --M

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-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...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;
}

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-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/de...lib_regex.html

Am I missing something?

Cheers! --M