Replace segments.

iterator
replace(
    iterator pos,
    string_view s);
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iterator
replace(
    iterator from,
    iterator to,
    string_view s);
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iterator
replace(
    iterator from,
    iterator to,
    std::initializer_list< string_view > init);
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template<
    class FwdIt>
iterator
replace(
    iterator from,
    iterator to,
    FwdIt first,
    FwdIt last);
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