[Bug libstdc++/124015] regex_traits::lookup_classname returns ctype_base::alpha for "graph" with icase=true

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124015

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:d93ae0cd1a0fcb87c74181ceba966ae1e7681f1c

commit r15-10928-gd93ae0cd1a0fcb87c74181ceba966ae1e7681f1c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Feb 10 20:01:32 2026 +0000

    libstdc++: Improve tests for std::regex_traits::lookup_classname [PR124015]

    libstdc++-v3/ChangeLog:

            PR libstdc++/124015
            * testsuite/28_regex/traits/char/lookup_classname.cc: Check for
            correct result for unrecognized classname. Check that lookup is
            case insensitive. Check that all required classnames are
            recognized. Check that icase flag only affects "lower" and
            "upper".
            * testsuite/28_regex/traits/wchar_t/lookup_classname.cc:
            Likewise.

    Reviewed-by: Tomasz KamiÅski <tkaminsk@redhat.com>
    (cherry picked from commit 81e492ba723f9cfdd69d4badfdec1c00983952a9)