npm package: @stdlib/regexp-regexp
Description: Return a regular expression to parse a regular expression string.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
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# reRegExp

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> [Regular expression][regexp] to parse a [regular expression][regexp] string.

<section class="installation">

## Installation

```bash
npm install @stdlib/regexp-regexp
```

</section>

<section class="usage">

## Usage

```javascript
var reRegExp = require( '@stdlib/regexp-regexp' );
```

#### reRegExp()

Returns a [regular expression][regexp] to parse a [regular expression][regexp] `string`.

<!-- eslint-disable stdlib/doctest -->

```javascript
var RE_REGEXP = reRegExp();
var bool = RE_REGEXP.test( '/^beep$/' );
// returns true

bool = RE_REGEXP.test( '' );
// returns false

var parts = RE_REGEXP.exec( '/^.*$/ig' );
// returns [ '/^.*$/ig', '^.*$', 'ig', 'index': 0, 'input': '/^.*$/ig' ]
```

[Regular expression][regexp] strings should be escaped.

<!-- eslint-disable no-useless-escape -->

```javascript
var RE_REGEXP = reRegExp();

var bool = RE_REGEXP.test( '/^\/([^\/]+)\/(.*)$/' );
// returns false

bool = RE_REGEXP.test( '/^\\/([^\\/]+)\\/(.*)$/' );
// returns true
```

#### reRegExp.REGEXP

[Regular expression][regexp] to parse a [regular expression][regexp] `string`.

```javascript
var bool = reRegExp.REGEXP.test( '/^beep$/' );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable no-useless-escape -->

<!-- eslint no-undef: "error" -->

```javascript
var reRegExp = require( '@stdlib/regexp-regexp' );

var RE_REGEXP = reRegExp();

var bool = RE_REGEXP.test( '/beep/' );
// returns true

bool = RE_REGEXP.test( '/^.*$/ig' );
// returns true

bool = RE_REGEXP.test( '/^\\/([^\\/]+)\\/(.*)$/' );
// returns true

bool = RE_REGEXP.test( '/^\/([^\/]+)\/(.*)$/' );
// returns false

bool = RE_REGEXP.test( '/boop' );
// returns false

bool = RE_REGEXP.test( '' );
// returns false
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/utils-regexp-from-string`][@stdlib/utils/regexp-from-string]</span><span class="delimiter">: </span><span class="description">create a regular expression from a regular expression string.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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<section class="links">

[npm-image]: http://img.shields.io/npm/v/@stdlib/regexp-regexp.svg
[npm-url]: https://npmjs.org/package/@stdlib/regexp-regexp

[test-image]: https://github.com/stdlib-js/regexp-regexp/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/regexp-regexp/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/regexp-regexp/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/regexp-regexp?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors

[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/regexp-regexp/tree/deno
[deno-readme]: https://github.com/stdlib-js/regexp-regexp/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/regexp-regexp/tree/umd
[umd-readme]: https://github.com/stdlib-js/regexp-regexp/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/regexp-regexp/tree/esm
[esm-readme]: https://github.com/stdlib-js/regexp-regexp/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/regexp-regexp/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/regexp-regexp/main/LICENSE

[regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

<!-- <related-links> -->

[@stdlib/utils/regexp-from-string]: https://www.npmjs.com/package/@stdlib/utils-regexp-from-string

<!-- </related-links> -->

</section>

<!-- /.links -->