Built-in Rules

This section describes the built-in validation checks and rules of EasyValidation library.

The EasyValidation library comes with 30+ built-in validation checks and rules. These rules can be added manually by custom rules or can be used with extension method or collection extension methods.

You can apply these rules by calling addRule() method of the Validator object like this.

var validator = myTextView.validator()
var isValid = validator.addRule(EmailRule()).check()

Here is a list of all those rules with their respective methods and collection extensions.

Rule Class	Method Names	Description
NonEmptyRule	nonEmpty()	Returns true if the text is not empty. And returns false if text is empty.
MinLengthRule	minLength()	Returns false if the length of text is less than given minimum length.
MaxLengthRule	maxLength()	Returns false if text length is greater than given length
EmailRule	validEmail()	Returns true if text is a valid email address.
ValidNumberRule	validNumber()	Returns true if the text is any valid number
GreaterThanRule	greaterThan()	Returns false if the text is number less than the given target number
GreaterThanOrEqualRule	greaterThanOrEqual()	Returns false if the text is number less than or equal to the given target number
LessThanRule	lessThan()	Returns false if the text is number greater than the given target number
LessThanOrEqualRule	lessThanOrEqaul()	Returns false if the text is number greater than or equal to the given target number
NumberEqualToRule	numberEqualTo()	Returns false if the text is a valid number and equal to the given target number
AllUpercCaseRule	allUperCase()	Returns false if at least one or more characters are lower case
AllLowerCaseRule	allLowerCase()	Returns false if at least one or more characters are upper case
AtLeastOneUperCaseRule	atleastOneUperCase()	Returns true if at least one or more characters are upper case
AtLeastOneLowerCaseRule	atleastOneLowerCase()	Returns true if at least one or more characters are lower case
AtLeastOneNumberCaseRule	atleastOneNumber()	Returns true if at least one or more characters are numbers
StartsWithNumberRule	startWithNumber()	Returns true if text starts with any number
StartsWithNoNumberRule	startWithNonNumber()	Returns false if text starts with any number
NoNumbersRule	noNumbers()	Returns false if the text any number or digit.
OnlyNumbersRule	onlyNumbers()	Returns false if text contains any alphabetic character
NoSpecialCharacterRule	noSpecialCharacters()	Returns true if text contain no special characters
AtleastOneSpecialCharacterRule	atleastOneSpecialCharacters()	Returns true if text contain at least one special characters
TextEqualToRule	textEqaulTo()	Returns false if the text is not equal to the given text
TextNotEqaulToRule	textNotEqualTo()	Returns true if the text is not equal to the given text
StartsWithRule	startsWith()	Returns true if the text starts with the given text
EndsWithRule	endsWith()	Returns true if the text ends with the given text
ContainsRule	contains()	Returns true if the text contains the given text
NotContainsRule	notContains()	Returns false if the text contains the given text
CreditCardRule	creditCardNumber()	Returns true if the text is valid credit card number. This supports Visa, Master Card, American Express, Diners Club, Discover, and JCB.
CreditCardWithSpacesRule	creditCardNumberWithSpaces()	Returns true if the text is valid credit card number with spaces between 4 characters. This supports Visa, Master Card, American Express, Diners Club, Discover and JCB.
CreditCardWithDashesRule	creditCardNumberWithDashes()	Returns true if the text is valid credit card number with dashes between 4 characters. This supports Visa, Master Card, American Express, Diners Club, Discover, and JCB.
ValidUrlRule	validUrl()	Returns true if the text is a valid URL
RegexRule	regex()	Returns true if the text matches passed RegEx pattern