# std::basic_string<CharT,Traits,Allocator>::replace_with_range

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< cpp‎ | string‎ | basic string

template< container-compatible-range<CharT> R > constexpr std::basic_string& replace_with_range( const_iterator first, const_iterator last, R&& rg ); |  | (since C++23)

Replaces the characters in the range `[`first`,` last`)` with the characters from the range rg.

Equivalent to

    return replace(first,
                   last,
                   std::basic_string(
                       std::from_range,
                       std::forward<R>(rg),
                       get_allocator())
    );

### Parameters

first, last | - | range of characters that is going to be replaced
rg | - | a container compatible range

### Return value

*this

### Complexity

Linear in size of rg.

### Exceptions

If the operation would result in `size`() >`` `max_size`(), throws std::length_error.

If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee).

### Notes

Feature-test macro | Value | Std | Comment
--- | --- | --- | ---
`__cpp_lib_containers_ranges` | 202202L | (C++23) | member functions that accept container compatible range

### Example

Run this code

    #include <algorithm>
    #include <cassert>
    #include <forward_list>
    #include <iterator>
    #include <string>

    int main()
    {
        using namespace std::literals;

        auto s{"Today is today!"s};
        constexpr auto today{"today"sv};
        constexpr auto tomorrow{"tomorrow's yesterday"sv};
        std::forward_list<char> rg;
        std::ranges::reverse_copy(tomorrow, std::front_inserter(rg));

        const auto pos{s.rfind(today)};
        assert(pos != s.npos);
        const auto first{std::next(s.begin(), pos)};
        const auto last{std::next(first, today.length())};

    #ifdef __cpp_lib_containers_ranges
        s.replace_range(first, last, rg);
    #else
        s.replace(first, last, rg.cbegin(), rg.cend());
    #endif

        assert("Today is tomorrow's yesterday!" == s);
    }

### See also

replace | replaces specified portion of a string (public member function)

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