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Find the first occurrence of any of the characters within the string.
std::size_t find_first_of( string_view sv, std::size_t pos = 0) const;
          Returns the index corrosponding to the first occurrence of any of the characters
          of sv within {begin() + pos, end()) if it exists, and npos otherwise.
        
Linear.
          The first occurrence of any of the characters within sv
          within the string starting at the index pos,
          or npos
          if none exists.
        
| Name | Description | 
|---|---|
| 
                     | The characters to search for. | 
| 
                     | 
                    The index to start searching at. The default argument for this
                    parameter is  |