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Find the first occurrence of a character not within the string.
template< typename T> constexpr size_type find_first_not_of( const T& t, size_type pos = 0) const;
            Constructs a temporary string_view_type
            object sv from t, and finds the first character that
            is not within sv, starting
            at the index pos.
          
Linear.
| Type | Description | 
|---|---|
| 
                       | The type of the object to convert. | 
            std::is_convertible<const T&, string_view>value
            && !stdis_convertible<const T&, const
            CharT*>value.
          
            The index corrosponding to the first occurrence of a character that is
            not in {sv.begin(), sv.end()) within {begin() + pos, end()) 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  |