How can I disable real-time validations in react-final-form?

Question

I am using the Field component, to which I pass the validations that I need. In the example below, in the validate prop I pass a regex to validate that it only contains letters. The problem is that validations are always done in real time when the field is updated, and I need it to only happen when I lose focus on the field. Is there any way to be able to do this?

<Field
                  name="name"
                  component={TextInput}
                  placeholder="Name"                      
                  validate={inputContainsOnlyWords}
                  
                />