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Unlike the other headers that declare alias templates in namespace pmr, <regex> includes <memory_resource>. That was done because the pmr::string::const_iterator typedef requires pmr::string to be complete, which requires pmr::polymorphic_allocator<char> to be complete. By using __normal_iterator<const char*, pmr::string> instead of the const_iterator typedef we can avoid the completeness requirement. This makes <regex> smaller, by not requiring <memory_resource> and its <shared_mutex> dependency, which depends on <chrono>. Backporting this will also help with PR 97876, where <stop_token> ends up being needed by <regex> via <memory_resource>. libstdc++-v3/ChangeLog: PR libstdc++/92546 * include/std/regex (pmr::smatch, pmr::wsmatch): Declare using underlying __normal_iterator type, not nested typedef basic_string::const_iterator.
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