---
application: "Intervention Validation"
version: "Version 4"
status: "stable"
---

# Lower Case Rule

## Validate a String in Lower Case

Discover how to validate lower case strings with the additional validation rules of Intervention Validation for your Laravel application.

> public Intervention\Validation\Rules\Lowercase::__construct()

The given value must be all lower case letters.

### Parameters

none

### Example

```php
use Illuminate\Support\Facades\Validator;
use Intervention\Validation\Rules\Lowercase;

$validator = Validator::make($request->all(), [
    'attribute-key' => new Lowercase(),
]);
```

---

## Become a Sponsor

### Intervention Validation needs your help to keep the project going

Intervention Validation is non-commercial, open source licensed and completely free to use. The considerable
effort required to maintain and develop the software is only possible with the financial support
of sponsors. There are two ways in which you can support this project.

- Support via [GitHub Sponsors](https://github.com/sponsors/Intervention)
- Support via [Ko-Fi](https://ko-fi.com/interventionphp)