[Bug libstdc++/71500] regex::icase only works on first character in a range

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71500

--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Sep 19 17:06:12 2017
New Revision: 252981

URL: https://gcc.gnu.org/viewcvs?rev=252981&root=gcc&view=rev
Log:
PR libstdc++/71500 restore C++11 compatibility in <regex>

        PR libstdc++/71500
        * include/bits/regex_executor.tcc
        (_Backref_matcher<BidIt, regex_traits<C>>::_M_apply): Use
        std::__equal4 instead of C++14 4-iterator overloads of std::equal.
        * include/bits/stl_algobase.h (__equal4): New functions implementing
        4-iterator overloads of std::equal for use in C++11.
        (equal(It1, It1, It2, It2), equal(It1, It1, It2, It2, BinaryPred)):
        Move function bodies to new __equal4 functions.
        * testsuite/28_regex/simple_c++11.cc: New.

Added:
    trunk/libstdc++-v3/testsuite/28_regex/simple_c++11.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/regex_executor.tcc
    trunk/libstdc++-v3/include/bits/stl_algobase.h