Mask an input on appcelerator - appcelerator

I have a phone input on my app:
<TextField id="FieldTelefone" class="textArea"></TextField>
I want to creat a telephone mask, preferably with REGEX, but I am having a hard time to do so on appcelerator.
I need it to be:
(xx)_xxxx-xxxx
or
(xx)_xxxx-xxxxx
the brazilian phone numbers pattern.
but I am not being able to do it with only javascript, I could however validate it, could anyone help me ?

This git repo will help you: https://github.com/Nyvra/titanium-appcelerator-fields-mask
You surely have to extend the script, but there you'll see how it works

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