https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102667
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:be3fbe792444bc750a8a1b37481bac9a84528949 commit r10-10181-gbe3fbe792444bc750a8a1b37481bac9a84528949 Author: Jonathan Wakely <jwak...@redhat.com> Date: Mon Oct 11 09:07:15 2021 +0100 libstdc++: Fix std::match_results::end() for failed matches [PR102667] The end() function needs to consider whether the underlying vector is empty, not whether the match_results object is empty. That's because the underlying vector will always contain at least three elements for a match_results object that is "ready". It contains three extra elements which are stored in the vector but are not considered part of sequence, and so should not be part of the [begin(),end()) range. libstdc++-v3/ChangeLog: PR libstdc++/102667 * include/bits/regex.h (match_result::empty()): Optimize by calling the base function directly. (match_results::end()): Check _Base_type::empty() not empty(). * testsuite/28_regex/match_results/102667.C: New test. (cherry picked from commit 84088dc4bb6a546c896a068dc201463493babf43)
