Reverse of String.Format?

Possible Duplicate:
Parsing formatted string.

How can I use a String.Format format and transform its output to its inputs?

For example:

string formatString = "My name is {0}.  I have {1} cow(s).";

string s = String.Format(formatString, "strager", 2);

// Call the magic method...
ICollection<string> parts = String.ReverseFormat(formatString, s);
// parts now contains "strager" and "2".

I know I can use regular expressions to do this, but I would like to use the same format string so I only need to maintain one line of code instead of two.