RegularExpression - Positive Integer with 1 Decimal Point

I can't seem to get the syntax correct for a 开发者_JS百科RegularExpression using C# to only allow positive numbers with up to 1 decimal point.

I have the following DataAnnotation for positive integers working:

[RegularExpression(@"[^\-][\d\.]*", ErrorMessage = "Positive integers only")]  

Any tips?

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You want ^\d+(\.\d)?$.

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[RegularExpression(@"^\d+(\.\d)?$", ErrorMessage = "Positive integers only")]

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I propose ^(0|[1-9]\d*(\.\d)?)$. That way you also rule out things like 0001.

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You may try @"^\d+([.]\d?)?$"
The "." is a special character and has to be escaped, otherwise the answer by SLaks is alright.