Zip Code validation

[swarovski]

I want to write some simple scripts to validate Zip Code on a dialog.

I have set the max length = 5

Which functions should I use to allow user only input digit?

Thanks in advance!

[swarovski]

I want to write some simple scripts to validate Zip Code on a dialog.

I have set the max length = 5

Which functions should I use to allow user only input digit?

Thanks in advance!

I have given up the validation.
And currently using a mask edit box.
prevent user from input letters..

[swarovski]

_regValidateZipCode = $_regZipCode$ + 0
if Variable _regValidateZipCode Equals
Set Variable _regValidateResult to $_regValidateResult$$NEWLINE$- Zip Code <invalid>
end

I am glad I found this method.
main idea is using mathematics function.
a valid number will always return a number
else will return empty string