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Showing content from https://en.cppreference.com/w/cpp/language/../memory/weak_ptr/../../string/basic_string/begin.html below:

std::basic_string<CharT,Traits,Allocator>::begin, std::basic_string<CharT,Traits,Allocator>::cbegin - cppreference.com

iterator begin();

const_iterator begin() const;

const_iterator cbegin() const noexcept;

Returns an iterator to the first character of the string.

begin() returns a mutable or constant iterator, depending on the constness of *this.

cbegin() always returns a constant iterator. It is equivalent to const_cast<const basic_string&>(*this).begin().

(none)

Iterator to the first character.

Constant.

libc++ backports cbegin() to C++98 mode.

#include <iostream>
#include <string>
 
int main()
{
    std::string s("Exemplar");
    *s.begin() = 'e';
    std::cout << s << '\n';
 
    auto i = s.cbegin();
    std::cout << *i << '\n';
//  *i = 'E'; // error: i is a constant iterator
}

Output:

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