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# no-octal-escape

[Added in v0.4.2](https://github.com/web-infra-dev/rslint/releases/tag/v0.4.2)
## Configuration


```ts title=rslint.config.ts
import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-octal-escape': 'error',
    },
  },
]);
```

## Rule Details

Disallows octal escape sequences in string literals.

As of the ECMAScript 5 specification, octal escape sequences in string literals are deprecated and should not be used. Unicode escape sequences should be used instead.

Examples of **incorrect** code for this rule:

```javascript
var foo = 'Copyright \251';
var foo = '\1';
var foo = '\01';
var foo = '\08';
```

Examples of **correct** code for this rule:

```javascript
var foo = 'Copyright \u00A9';
var foo = '\x51';
var foo = '\0';
var foo = '\\1';
```

## Original Documentation

- [ESLint: no-octal-escape](https://eslint.org/docs/latest/rules/no-octal-escape)
- [Source code](https://github.com/eslint/eslint/blob/v10.8.1/lib/rules/no-octal-escape.js)