Spans are a window into the original array. Spans only work with arrays. Spans uses Index and Range types.

string name = "Samantha Jones";

int lengthOfFirst = name.indexOf(' '); // The length of the first name.
int lengthOfLast = name.Length - lengthofFirst - 1; // The length of the last name.

ReadOnlySpan<char> nameAsSpan = name.AsSpan(); // Convert the string to a span.
ReadOnlySpan<char> firstNameSpan = nameAsSpan[0..lengthOfFirst];
ReadOnlySpan<char> lastNameSpan = nameAsSpan[^lengthOfLast..^0];

Console.WriteLine($"First name: {firstNameSpan.ToString()}, Last name: {lastNameSpan.ToString());