Insert a string.

string&
insert(
    std::size_t pos,
    string_view sv);
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Insert a character.

string&
insert(
    std::size_t pos,
    std::size_t count,
    char ch);
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string&
insert(
    size_type pos,
    char ch);
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Insert a range of characters.

template<
    class InputIt>
string&
insert(
    size_type pos,
    InputIt first,
    InputIt last);
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