Model validation reference==========================This guide section doesn't describe how validation works but instead describes all Yii validators and their parameters.In order to learn model validation basics please refer to [Model, Validation subsection](model.md#Validation).Standard Yii validators------------------------`boolean`: [[BooleanValidator]]-`captcha`: [[CaptchaValidator]]-`compare`: [[CompareValidator]]-`date`: [[DateValidator]]-`default`: [[DefaultValueValidator]]-`double`: [[NumberValidator]]-`email`: [[EmailValidator]]-`exist`: [[ExistValidator]]-`file`: [[FileValidator]]-`filter`: [[FilterValidator]]-`in`: [[RangeValidator]]-`integer`: [[NumberValidator]]-`match`: [[RegularExpressionValidator]]-`required`: [[RequiredValidator]]-`string`: [[StringValidator]]-`unique`: [[UniqueValidator]]-`url`: [[UrlValidator]]TBD: refer to http://www.yiiframework.com/wiki/56/ for the format