Here is a list of predefined validators. You cannot use these names for your custom validators.

|| **name** || **arguments** || **task**      ||
|| email 		|| 							 || Check if value is valid email.|| 
|| notblank || 							 || Check if value is not blank.||
|| notnull  ||               || Check if value is not null.||
|| country  ||               || Check if valid is valid country code.||
|| ip       ||               || Checks if value is valid IP (internet protocol) address.||
|| htmlcolor ||              || Checks if value is valid html color.||
|| nospace  ||               || Check if value has no space chars. ||
|| range    || [min,max]     || Checks if value is in range specified by arguments.||
|| unique   ||							 || Checks if value is unique in its database table. ||
|| regexp   || [expression]  || Check if valie matches a given regexp. ||

