https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102480
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:f38cd3bdb4cd429a5f7082ea91793a59b37d47b9 commit r12-3963-gf38cd3bdb4cd429a5f7082ea91793a59b37d47b9 Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Sep 29 13:48:19 2021 +0100 libstdc++: Implement std::regex_constants::multiline (LWG 2503) This implements LWG 2503, which allows ^ and $ to match line terminator characters, rather than only matching the beginning and end of the entire input. The multiline option is only valid for ECMAScript, but for other grammars we ignore it rather than throwing an exception. This is related to PR libstdc++/102480, which incorrectly said that ECMAscript should match the beginning of a line when match_prev_avail is used. I think that's only supposed to happen when multiline is used. The new regex_constants::multiline and basic_regex::multiline constants are not defined for strict -std=c++11 and -std=c++14 modes, but regex_constants::__multiline is always defined, so that the implementation can use it internally. Signed-off-by: Jonathan Wakely <jwak...@redhat.com> libstdc++-v3/ChangeLog: * include/bits/regex.h (basic_regex::multiline): Define constant for C++17. * include/bits/regex_constants.h (regex_constants::multiline): Define constant for C++17. (regex_constants::__multiline): Define duplicate constant for internal use in C++11 and C++14. * include/bits/regex_executor.h (_Executor::_M_match_multiline()): New member function. (_Executor::_M_is_line_terminator(_CharT)): New member function. (_Executor::_M_at_begin(), _Executor::_M_at_end()): Use new member functions to support multiline matches. * testsuite/28_regex/algorithms/regex_match/multiline.cc: New test.
