[Plugin: Contact Form 7] Minlength?

Hi guys

It’s really a great a simple plugin. I’m wondering, though: is there some sort of minlength, just like there is a maxlength?

I’ve made a form, where people need to write some numbers (is like a ID number for Danish companies), and I want to make sure that they get the right amount of digits. E.g. eight digits.

All the best,

newbie Thomas