Default rules

required

If the value contains any value, it returns true . It also returns false for an empty array, empty object, undefined and null.

empty

If there is no value in the value, it returns true . However, if the value is null, it returns false.

regexp

Returns the result of testing the value with an `option.test`.

email

If value is a valid email address, it returns true .

list

If the value exists in the option.list , it returns true .

number

If the value is a number, it returns true.

integer

If the value is an integer, it returns true.

naturalNumber

If the value is a natural number, it returns true.

positiveNumber

If the value is positive, it returns true. If value is 0, it returns false.

negativeNumber

If the value is negative, it returns true. If value is 0, it returns false.

zero

If value is 0, it returns true.

age

If the value is a valid age value, it returns true.

equal

If the value matches the value specified in option.others, it returns true.

letters

If the value is a number in the specified range, it returns true.

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