Widget char with expression regular configurable

Registered by Moisés López - http://www.vauxoo.com

There is a char widget to configure a regular expression, because in my country it is widely used.
For example, RFC: fields.char('RFC', size=6, expreg='[A-Z] [A-Z] [A-Z] [A-Z] [0-9] [0-9]')
And I have a widget I created for this, but I have not been able to publish

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