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Find the first occurrence of any of the characters not within the string.
constexpr size_type find_first_not_of( const_pointer s, size_type pos = 0) const;
            Finds the first occurrence of a character that is not within the string
            pointed to by s of length
            count within the string
            starting at the index pos,
            where count is traits_type::length(s).
          
Linear.
            The index corrosponding to the first character of {begin()
            + pos, end())
            that is not within {s, s + count) if it exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The characters to ignore. | 
| 
                       | 
                      The index to start searching at. The default argument for this
                      parameter is  |