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Find the first occurrence of any of the characters not within the string.
std::size_t find_first_not_of( string_view sv, std::size_t pos = 0) const;
            Returns the index corrosponding to the first character of {begin() + pos, end())
            that is not within sv
            if it exists, and npos otherwise.
          
Linear.
            The first occurrence of a character that is not within sv within the string starting at the
            index pos, or npos if none exists.
          
| Name | Description | 
|---|---|
| 
                       | The characters to ignore. | 
| 
                       | 
                      The index to start searching at. The default argument for this
                      parameter is  |