Named Group support for regular expressions in TR1?

[DomoChan]

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

[mlimber]

On Aug 10, 5:21*pm, [e-mail] 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

[DomoChan]

On Aug 11, 8:59*am, mlimber <[e-mail]:

On Aug 10, 5:21*pm, [e-mail] 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;
}

[mlimber]

On Aug 11, 7:04*pm, [e-mail] wrote:

On Aug 11, 8:59*am, mlimber <[e-mail]:

On Aug 10, 5:21*pm, [e-mail] 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

[Pete Becker]

On 2008-08-10 17:21:17 -0400, Do******@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>expression) 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)