Only your first and last regexes give an error, it would be helpful if you said what you expect them to do.


The sequence \w is intepreted as [_[:alnum:]] but is rejected inside a bracket  expression. 

Reduced:

#include <regex>
int main()
{
  std::regex{ R"([\w])" };
}

For this to match a string such as "w" or "\\" it should be R"([\\w])"

To use the special \w class you can use [_[:alnum:]] as a workaround.


Tim, could you take a look at this please?

I don't think the C++ standard is clear, but Perl does interpret [\w] as equivalent to just \w so I think we should do the same.

The C++ standard refers to ECMA-262 which defines [\w] as Perl does.

So it does, thanks, Andreas. I read C++11 [re.grammar]/7 as saying those classes are part of the changes to the ECMAScript spec.

The first regex is used to find illegal characters in symbol name in my project. The last regex is used to tokenize command line arguments. Those regexes work in Visual Studio 2012/2013 and clang with libc++.

Author: timshen
Date: Tue May 20 04:31:54 2014
New Revision: 210630

URL: http://gcc.gnu.org/viewcvs?rev=210630&root=gcc&view=rev
Log:
2014-05-20  Tim Shen  <timshen91@gmail.com>

	PR libstdc++/61227
	* include/bits/regex_compiler.h
	(_BracketMatcher<>::_M_add_character_class): Add negative character
	class support.
	* include/bits/regex_compiler.tcc (_BracketMatcher<>::_M_apply):
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/char/quoted_char.cc:
	Add more testcases.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/regex_compiler.h
    trunk/libstdc++-v3/include/bits/regex_compiler.tcc
    trunk/libstdc++-v3/testsuite/28_regex/algorithms/regex_match/ecma/char/quoted_char.cc

Hi. I'm using Debain Testing and today according to changelog:
* Update to SVN 20140527 (r210956) from the gcc-4_9-branch.

The bug still persists.

Because nothing changed on the 4.9 branch

Author: redi
Date: Tue Jun  3 17:26:24 2014
New Revision: 211192

URL: http://gcc.gnu.org/viewcvs?rev=211192&root=gcc&view=rev
Log:
Backport from mainline
2014-05-20  Tim Shen  <timshen91@gmail.com>

	PR libstdc++/61227
	* include/bits/regex_compiler.h
	(_BracketMatcher<>::_M_add_character_class): Add negative character
	class support.
	* include/bits/regex_compiler.tcc (_BracketMatcher<>::_M_apply):
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/char/quoted_char.cc:
	Add more testcases.

Modified:
    branches/gcc-4_9-branch/libstdc++-v3/ChangeLog
    branches/gcc-4_9-branch/libstdc++-v3/include/bits/regex_compiler.h
    branches/gcc-4_9-branch/libstdc++-v3/include/bits/regex_compiler.tcc
    branches/gcc-4_9-branch/libstdc++-v3/testsuite/28_regex/algorithms/regex_match/ecma/char/quoted_char.cc

Now it's fixed on the 4.9 branch.