Hi,

Is it possible to have alphanumeric validation rule not in terms of alpha or numeric, but both of them? Practically that means that visitor must write some letters and numbers.
I would need that in my address field where some people don't write their home address (the number)

I am OK with modifying some code.
I don't know if i want to create additional fields, since my Form is already launched and have more that 100 entries already. With additional fields, I'm worried that i will mess up the export later on.