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Find the last occurrence of a character not within the string.
std::size_t find_last_not_of( string_view sv, std::size_t pos = npos) const;
            Returns the index corrosponding to the last character of {begin(), begin() + pos}
            that is not within sv
            if it exists, and npos otherwise.
          
Linear.
            The last occurrence of a character that is not within sv
            within the string before or at the index pos,
            or npos
            if none exists.
          
| Name | Description | 
|---|---|
| 
                       | The characters to ignore. | 
| 
                       | 
                      The index to stop searching at. The default argument for this
                      parameter is  |