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Level 3

I have a numeric field that has a combination of 8 numbers/characters

It must be posible that the first number is a zero.

So i'm using the following pattern num{99999999}

This works fine, but when they enter only 2 numbers the field fils with zero's

How can i change this?

And how to do a validation on keystroke or exit that gives an error when the enter a non numeric character?

I entered 99999 on the validation pattern en entered an error message, but it doesn't work