Echo JS 0.11.0

The regular expression part of this is rather small.
Most of the article talks about mapping the fields to US states, cities and zipcodes.
Question is: do you want to maintain those yourself ? (and load them all client side ;-))

Alternatively one could use:
https://developers.google.com/maps/documentation/javascript/places-autocomplete

or if you only need the US:
https://www.ups.com/us/en/services/technology-integration/us-address-validation.page

and there are probably many more ;-)