How to validate the number of characters in Text Entry box?

Hi
I have inserted a text entry box and assigned a variable (UserName) to it. Now, I need to limit the entry to a maxinum number of 20 characters. In other words, how do I validate the number of characters in the text entry box and provide feedback if it is more than 20 characters?

Thanks.
I have posted this as a query on the relevant post on Jim's website. I am too new to regular expressions. I hope he will help with an example as well.
http://captivatedev.com/2012/07/31/adobe-captivate-6-x-widget-text-entry-box-validator/
Sreekanth

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How to validate the number of characters in Text Entry box?

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