How to extract decimal number from string in C#

string sentence = "X10 cats, Y20 dogs, 40 fish and 1 programmer.";
string[] digits = Regex.Split (sentence, @"\D+");

For this code I get these values in the digits array

10,20,40,1

string sentence = "X10.4 cats, Y20.5 dogs, 40 fish and 1 programmer.";
string[] digits = Regex.Split (sentence, @"\D+");

For this code I get these values in the digits array

10,4,20,5,40,1

But I would like to get like

10.4,20.5,40,1 as decimal numbers. How can I achieve this?