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<code>&lt;regex&gt;</code>: (a)(\3)(c) should be accepted

bugSomething isn't workingSomething isn't working

regexmeow is a substring of homeownermeow is a substring of homeowner

Status: Open.

#6091 In microsoft/STL;

· Alcaro opened on Feb 18, 2026

<code>&lt;condition_variable&gt;</code>: <code>wait_for</code> with a Predicate used with floating point duration is extremely unsafe

chronoC++20 chronoC++20 chrono

Status: Open.

#6088 In microsoft/STL;

· CookiePLMonster opened on Feb 16, 2026

<code>&lt;algorithm&gt;</code>: Extend <code>vector&lt;bool&gt;</code> algorithms optimization for <code>ranges::</code> algorithm

performanceMust go fasterMust go faster

Status: Open.

#6078 In microsoft/STL;

· AlexGuteniev opened on Feb 6, 2026

<code>&lt;flat_map&gt;</code>, <code>&lt;flat_set&gt;</code>: Unify <code>_Emplace_hint()</code>

enhancementSomething can be improvedSomething can be improved

flat_meowC++23 container adaptorsC++23 container adaptors

Status: Open.

#6069 In microsoft/STL;

· StephanTLavavej opened on Feb 4, 2026

<code>&lt;filesystem&gt;</code>: <code>weakly_canonical</code> doesn't make absolute path for relative path with only correct drive.

bugSomething isn't workingSomething isn't working

filesystemC++17 filesystemC++17 filesystem

Status: Open.

#6054 In microsoft/STL;

· Extra-Creativity opened on Jan 28, 2026

<code>&lt;iomanip&gt;</code>: ADL for the return types of <code>get_time</code>/<code>put_time</code> looks into the global namespace

LWG issue neededA wording defect that should be submitted to LWG as a new issueA wording defect that should be submitted to LWG as a new issue

Status: Open.

#6048 In microsoft/STL;

· frederick-vs-ja opened on Jan 26, 2026

<code>&lt;flat_map&gt;</code>: Missing test coverage

flat_meowC++23 container adaptorsC++23 container adaptors

testRelated to test codeRelated to test code

Status: Open.

#6045 In microsoft/STL;

· StephanTLavavej opened on Jan 23, 2026

Test: Clarify "non-standard extension"

documentationRelated to documentation or commentsRelated to documentation or comments

Status: Open.

#6037 In microsoft/STL;

· frederick-vs-ja opened on Jan 22, 2026

<code>&lt;algorithm&gt;</code>: std::uninitialized_copy used memmove instead of memcpy

performanceMust go fasterMust go faster

Status: Open.

#6029 In microsoft/STL;

· TymianekPL opened on Jan 20, 2026

<code>&lt;regex&gt;</code>: Remove nodes for capturing group 0 from the NFA

performanceMust go fasterMust go faster

regexmeow is a substring of homeownermeow is a substring of homeowner

vNextBreaks binary compatibilityBreaks binary compatibility

Status: Open.

#6025 In microsoft/STL;

· muellerj2 opened on Jan 18, 2026

ARM64EC vector algorithms

questionFurther information is requestedFurther information is requested

Status: Open.

#5998 In microsoft/STL;

· AlexGuteniev opened on Jan 7, 2026

Test: On <code>.compile.fail.cpp</code> in the libcxx test suite

questionFurther information is requestedFurther information is requested

testRelated to test codeRelated to test code

Status: Open.

#5981 In microsoft/STL;

· frederick-vs-ja opened on Dec 29, 2025