| Name | Description |
|---|---|
| Alnum | Alnum Rule (Alphanumeric) |
| Alpha | Alpha Rule |
| Callback | Callback Rule |
| CallbackTest | |
| Digits | Digits Rule |
| HtmlEntities | Html Entities Filter |
| PregReplace | PregReplace Rule Replaces based on regular expression, will replace with empty if no replacement is defined. |
| RegExp | RegExp Rule |
| Rule | Base class for a Filtering Rule, it implements common behaviour |
| RuleTest | |
| StripTags | StripTags Rule |
| ToLower | ToLower Rule |
| ToUpper | ToUpper Rule |
| Trim | Trim Rule |
