[llvm-bugs] [Bug 40052] New: boost::regex match but not std::regex

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40052

            Bug ID: 40052
           Summary: boost::regex match but not std::regex
           Product: libc++
           Version: 6.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: georg-bsd at schorsch-tech.de
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Created attachment 21237
  --> https://bugs.llvm.org/attachment.cgi?id=21237&action=edit
Testcase

I got the attached program. It has a global locale set (de_DE.UTF-8).

I think it might be a bug in libc++ because 
on Windows(MSVC 2013 & MSVC 2017) and on Linux (gcc 8.2 + libstdc++) this regex
(from std) matches with the global locale from boost. Also the regex from boost
matches (replace std::regex by boost::regex). 

This bug triggers only (also on my box and only on freebsd with clang and
libc++) when i use boost::locale. With std::locale() it matches.

I already submitted this bug to FreeBSD and to boost.org.

For reference, here are the links
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233994

Boost.locale says:
[quote]
Boost.Regex and Boost.Locale aren't related, the locale generated by
Boost.Locale is "C" locale with addons unrelated to Boost.Regex
[/quote]
https://github.com/boostorg/locale/issues/35

FreeBSD says, it is a bug in boost.locale.

As both of my direct upstream bugtrackers seem to "dislike" this bug, i report
it to clang/libc++ directly.

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