What is the regular expression for amount field in c#?

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C#

Windows

Hi,

Can anyone give regular expression to validate amount field.
So that i match that regex to my amount text field.

My regex should satisfy the below condition.

1) Number.Number (e.g 99.99)
2) Number. (e.g 99.)
3) .Number (e.g .99)
4) Number (e.g 9999)

***But it should not allow single dot (.)

I used the below regex to amount field in the designer:
@"^(([0-9]{0,9})(\.+)\d{0,2}|[0-9]{0,9})$"

I want the matching regex to satisfy the above conditions.

Thanks in advance.