Regular Expression working in .Net but not in Classic ASP

I have the below regular expression which is working fine in .NET however it is not working in Classic ASP. The Regular expression is used to validate for a least one digit and one character.

The expression is:

Set regPassword = New R开发者_开发百科egExp
regPassword.Pattern = "^(?=.*\d)(?=.*[A-Za-z]).{6,30}$"
Response.Write(regPassword.Test("Test456"))

The result of the above returns False.

Does anyone know a workaround for this?

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 ^.(?=.*\d)(?=.*[A-Za-z]){6,30}

Here is a good resource on the VBScript Regex engine.

Edit: According to the comments, this works?

(.*[a-zA-Z].*[0-9]|.*[0-9].*[a-zA-Z])