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Find the first occurrence of any of the characters within the string.
constexpr size_type find_first_of( const_pointer s, size_type pos, size_type n) const;
            Finds the first occurrence of any of the characters within the string
            pointed to by s within
            the string starting at the index pos.
          
Linear.
            The index corrosponding to the first occurrence of any of the characters
            in {s, s + n) within {begin() + pos, end()) if it exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The characters to search for. | 
| 
                       | The index to start searching at. | 
| 
                       | The length of the string to search for. |