Validate text entry character counts

Is it possible to validate text entry fields based on character count? I have slides with 5 text entry boxes per slide. The triggers for each TEB are set value when control loses focus and add 1 to another variable (slideCount). 

In this context, the user entered values can be anything, I just need to check to make sure that they entered something into each box. Is it possible to check based on character counts? I was thinking that each box has to have a minimum of 3 characters before the value of slideCount can increase.

Any suggestions will be greatly appreciated.

Thanks,

Chris

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