Looks like this is a regression. Reading this http://json-schema.org/latest/json-schema-validation.html#anchor104, formart keyword will work for all the types, not only string. I will give a try another way to write the schema today.
Looks like this is a regression. Reading this http:// json-schema. org/latest/ json-schema- validation. html#anchor104, formart keyword will work for all the types, not only string. I will give a try another way to write the schema today.