A message to be used as hint, when giving a hint on the expected pattern. There is no default
hint for this property.
validate(value: V): Promise<void>
Validates value for matches using the regular expression provided by the pattern. This method
does not raise an error when value is the empty string or null; the method returns a Promise
which resolves indicating that the validation was successful. If the application wants the empty string to fail validation,
then the application should chain in the required validator (e.g., set required on the input).