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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - boost::regex match but not std::regex"
href="https://bugs.llvm.org/show_bug.cgi?id=40052">40052</a>
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<th>Summary</th>
<td>boost::regex match but not std::regex
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>6.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>FreeBSD
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>georg-bsd@schorsch-tech.de
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21237" name="attach_21237" title="Testcase">attachment 21237</a> <a href="attachment.cgi?id=21237&action=edit" title="Testcase">[details]</a></span>
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
<a href="https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233994">https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233994</a>
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]
<a href="https://github.com/boostorg/locale/issues/35">https://github.com/boostorg/locale/issues/35</a>
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.</pre>
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