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Find the last occurrence of a character not within the string.
constexpr size_type find_last_not_of( const_pointer s, size_type pos, size_type n) const;
            Finds the last occurrence of a character that is not within the string
            pointed to by s within
            the string before or at the index pos.
          
Linear.
            The index corrosponding to the last character of {begin(),
            begin()
            + pos} that is not within {s, s + n)
            if it exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The characters to ignore. | 
| 
                       | 
                      The index to stop searching at. The default argument for this
                      parameter is  | 
| 
                       | The length of the characters to ignore. |