.NET - How can you split a "caps" delimited string into an array?

Just for a little variety... Here's an extension method that doesn't use a regex.

public static class CamelSpaceExtensions
{
    public static string SpaceCamelCase(this String input)
    {
        return new string(Enumerable.Concat(
            input.Take(1), // No space before initial cap
            InsertSpacesBeforeCaps(input.Skip(1))
        ).ToArray());
    }

    private static IEnumerable<char> InsertSpacesBeforeCaps(IEnumerable<char> input)
    {
        foreach (char c in input)
        {
            if (char.IsUpper(c)) 
            { 
                yield return ' '; 
            }

            yield return c;
        }
    }
}

Regex.Replace("ThisIsMyCapsDelimitedString", "(\\B[A-Z])", " $1")

I made this a while ago. It matches each component of a CamelCase name.

/([A-Z]+(?=$|[A-Z][a-z])|[A-Z]?[a-z]+)/g

For example:

"SimpleHTTPServer" => ["Simple", "HTTP", "Server"]
"camelCase" => ["camel", "Case"]

To convert that to just insert spaces between the words:

Regex.Replace(s, "([a-z](?=[A-Z])|[A-Z](?=[A-Z][a-z]))", "$1 ")

---

If you need to handle digits:

/([A-Z]+(?=$|[A-Z][a-z]|[0-9])|[A-Z]?[a-z]+|[0-9]+)/g

Regex.Replace(s,"([a-z](?=[A-Z]|[0-9])|[A-Z](?=[A-Z][a-z]|[0-9])|[0-9](?=[^0-9]))","$1 ")

Great answer, MizardX! I tweaked it slightly to treat numerals as separate words, so that "AddressLine1" would become "Address Line 1" instead of "Address Line1":

Regex.Replace(s, "([a-z](?=[A-Z0-9])|[A-Z](?=[A-Z][a-z]))", "$1 ")