How to check if an attribute match a specific regex at compile time?

I'm trying to understand how the Assem开发者_StackOverflow社区blyVersionAttribute validates the string format at compile time. I would like to implement something similar in my application (if possible).

For example this is fine :

    [assembly: AssemblyVersion("1.0.0.1")]

But this one will cause a compiler error (because the format is invalid) :

    [assembly: AssemblyVersion("1a.0.0.1")]

How can I validate a custom attribute in the same way?

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IIRC It's the compiler which has this functionality built-in and treats the AssemblyVersion attribute as special as it has to use its value and bake it into the resulting assembly. Unless writing your own compiler I doubt you could do this with custom attributes. IIRC the best you could do is to restrict the custom attribute target: whether it applies to classes, methods, properties, ... only.

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If you decided to implement by Regular Expression try this regex:

\[assembly: AssemblyVersion\(\"([0-9]{1,}(\.){1}){3}([0-9]{1,}){1}\"\)\]