Kohana 3 Validation Rules / Kohana 3 Validation Option

Rule	Parameter	Description	Example
not_empty	No	Returns FALSE if form field is empty
min_length	Yes	Returns FALSE if the field is too short	length[5] - minimum 5 characters long
max_length	Yes	Returns FALSE if the field is too long	length[30] - maximum 30 characters long
exact_length	Yes	Returns FALSE if the field is too short or too long	length[25] - 25 characters only
matches	Yes	Returns FALSE if field does not match field(s) in parameter	matches[password_again]
date	No	Returns FALSE if form field is not a valid date
regex	Yes	Returns FALSE if form field does not fulfill the regular expression	regex[expression] - regular expression to match (including delimiters)
email	Optional	Returns FALSE if email is not valid	mail[TRUE] - rfc822 strict
email_domain	No	Returns FALSE if domain of an email does not have valid MX record
url	No	Returns FALSE if url is not valid
ip	Optional	Returns FALSE if ip is not valid	ip[TRUE] - allow private IP networks
credit_card	Yes	Returns FALSE if credit card is not valid	credit_card[mastercard] - card type, or an array of card types
phone	Optional	Returns FALSE if phone number is not a valid length	phone[7,10,11,14] - either 7, 10, 11 or 14 digits long (default is 7, 10 and 11)
alpha	Optional	Returns FALSE if form field does not consist only of alphabetical characters only	alpha[TRUE] - trigger UTF-8 compatibility
alpha_numeric	Optional	Returns FALSE if form field does not consist only of alphabetical or numeric characters	alpha_numeric[TRUE] - trigger UTF-8 compatibility
alpha_dash	Optional	Returns FALSE if form field does not consist only of alphabetical, numeric, underscore and dash characters	alpha_dash[TRUE] - trigger UTF-8 compatibility
digit	Optional	Returns FALSE if form field does not consist only of digit characters (no dots or dashes).	digit[TRUE] - trigger UTF-8 compatibility
numeric	No	Returns FALSE if form field is not a valid number (positive, negative or decimal)
decimal	Optional	Returns FALSE if form field is not in proper decimal format	decimal - is any valid decimal format
		Optional parameter is for a specific decimal format	decimal[4,2] - is 4 digits and 2 decimal places
range	Yes	Returns FALSE if form field is not withing the range min and max	range[1,10] - between 1 and 10 include
color	No	Returns FALSE if form field is not proper hexadecimal HTML color value