Validator which accepts all strings.
Validator which accepts a string that can be or be part of proper column name.
Validates if NumericParameter value is within range bounds.
Validates if StringParameter value matches the given regex.
Validator which accepts a single character.
Represents anything that validates parameter.
Represents anything that validates parameter.
Validator which accepts a string that can be or be part of proper column name. Column name cannot be empty and must be without backticks. Column with a backtick character fails in some operations (e.g. Convert Type).