{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "foo": {
      "type": "string",
      "format": "no_match"
    },
    "contact": {
      "type": "string",
      "format": "email"
    }
  },
  "required": ["foo", "contact"],
  "type": "object"
}