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The overload of std::regex_replace that takes a std::basic_string as the fmt argument (for the replacement string) is implemented in terms of the one taking a const C*, which uses std::char_traits to find the length. That means it stops at a null character, even though the basic_string might have additional characters beyond that. Rather than duplicate the implementation of the const C* one for the std::basic_string case, this moves that implementation to a new __regex_replace function which takes a const C* and a length. Then both the std::basic_string and const C* overloads can call that (with the latter using char_traits to find the length to pass to the new function). libstdc++-v3/ChangeLog: PR libstdc++/103664 * include/bits/regex.h (__regex_replace): Declare. (regex_replace): Use it. * include/bits/regex.tcc (__regex_replace): Replace regex_replace definition with __regex_replace. * testsuite/28_regex/algorithms/regex_replace/char/103664.cc: New test.
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