What is the better solution to format/restrict *-input entry in Polymer 1.0

I would like to know if exists best practices to format and restrict on *-input elements entry in Polymer 1.0.

For example:

• Number/Currency = '999.999.999,99'

• Date = 'dd/mm/yyyy'

  1. Is there a pattern default to guarantee that entry just number, comma and points?
  2. Is there some form to format the display, similar to expressions filter in OLD-Polymer?

iron-input supports an allowed-pattern attribute https://elements.polymer-project.org/elements/iron-input