ConstCustom validator that allows any validation logic.
Validates that a value is a valid email address.
Validates maximum string length.
Validates minimum string length.
Validates that a string contains no special characters. Allows letters, numbers, spaces, hyphens, and underscores.
Validates that a string matches a regex pattern.
Validates a numeric range.
Validates that a string value is not empty.
Validates that a value is a valid URL.
Common validator factory functions.