Regular Expressions let you do pattern matching in VBScript and ASP. In essence, you can validate that any input string matches up to your required letter/number settings.
When you truly begin to base your website on database content, it´s time to get yourself a dedicated MS-SQL or MySQL database system. This helps guarantee you proper response time and performance.
Usually when you code an ASP script, the variables you use only exist while the script runs. But what if you want to code a shopping cart, or something else where data is kept active?