# Regex ASCII character class

## Function

Explains ASCII character-class syntax.

## Syntax

```bt
regex(pattern, flags)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| pattern | String | No | '' | ASCII character classes such as [[:digit:]] and [[:alpha:]] can be used. |
| flags | String | No | '' | Regular flags. |

## Return value

| Type | Description |
| ------ | ------ |
| Regex | Returns a Regex object. |

## Example

```bt
rule = regex('^[[:digit:]]+$', '')
result = rule.test('2026')

// Output: true
print result
```

## Notes

- The ASCII class only matches characters in the ASCII range.