public static class CliValidationExtensions| AddValidator(Argument, CliValidationRules) | Adds validation rules to an argument. Validation rules can be used to provide errors based on user input. | 
| AddValidator(Option, CliValidationRules) | Adds validation rules to an option's argument. Validation rules can be used to provide errors based on user input. | 
| AddValidator(Argument, String, String) | Adds a validation pattern to an argument. A validation pattern can be used to provide errors based on user input. | 
| AddValidator(Option, String, String) | Adds a validation pattern to an option's argument. A validation pattern can be used to provide errors based on user input. |