Does anyone know how to trigger a validator on a TextInput based on a
certain string value?

I have a regular TextInput with a regular Validator attached to it
(required Validation).  I would like to also trigger this Validator so
that the red outline and tooltip displays when there is a particular
value in the text property. 

So if the TextInput is empty, then the required validation kicks in,
and if the text property contains for example, "foo", then then the
Validator fires as well.

Is there a quick and easy way to do this without overridding the
Validator?

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