> For the complete documentation index, see [llms.txt](https://redd.gitbook.io/react-advanced-form/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://redd.gitbook.io/react-advanced-form/components/form/props/rules.md).

# rules

## Specification

Form-specific validation rules schema.

> Providing form-specific rules is designed to extend/rewrite the validation behavior of certian forms. For general usage it is recommended to provide the validation rules and messages through the [`FormProvider`](/react-advanced-form/components/form-provider.md) component to be applied application-wide.

## Example

```jsx
import React from 'react'
import { Form } from 'react-advanced-form'

const formRules = {
  extend: true, // merge the current schema with the FormProvider's one
  type: {
    tel: ({ value }) => customPhoneValidationForThisFormOnly(value),
  },
}

export default class Example extends React.Component {
  render() {
    return (
      <Form rules={formRules}>
        {/* Fields here */}
      </Form>
    )
  }
}
```

## Materials

* [`FormProvider`](/react-advanced-form/components/form-provider.md)
* [Validation rules](broken://pages/-LDfz_oUOpBh6NcqliRb)