A class that validates text input to make sure its valid. These classes can be added to any TextInput to limit the type of input the user can enter. Note: this cannot be an interface due to serialization.

Make sure input don't contain double spaces or tabs.

Make sure input contains only letters, numbers, underscores or hyphens (and optionally spaces).

Make sure input contains only english characters.

Make sure input is always title, eg starts with a capital letter followed by lowercase.

Make sure input is numeric and optionally validate min / max values.