Return the last number of “Test”

[mv8167]

How can I use RegEx to just return the last number of “Test”?

Code:

Test = "NestedGrid1" or Test = "NestedGrid15"

To return 1 or 15?

I did figure this out:
xNGNum = replace(Test, "NestedGrid","")

but i am curious if there is a better way.

thx