https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102667
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-11 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:2560bab6ceb7c1eb7c5cdadb5f0a608ac166b829 commit r11-9099-g2560bab6ceb7c1eb7c5cdadb5f0a608ac166b829 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)
