c# - Regex for number at the end of string?

Question

I want to find out if a string ends with number (with/without decimal). If it ends, I want to extracts it.

"Test1" => 1
"Test"  => NOT FOUND
"Test123" => 123
"Test1.1" => 1.1

I have missed a few details.
1. Prior to number, string can contain special characters also
2. It is single line, not multiline.

Answer 1

give this pattern a try,

d+(.d+)?$

A version with a non-capturing group:

d+(?:.d+)?$