npm package: @stdlib/utils-regexp-from-string
Description: Create a regular expression from a regular expression string.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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# RegExp

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

> Create a [regular expression][regexp] from a [regular expression][regexp] string.

<section class="installation">

## Installation

```bash
npm install @stdlib/utils-regexp-from-string
```

</section>

<section class="usage">

## Usage

```javascript
var reFromString = require( '@stdlib/utils-regexp-from-string' );
```

#### reFromString( str )

Parses a [regular expression][regexp] `string` and returns a new [regular expression][regexp].

```javascript
var re = reFromString( '/beep/' );
// returns /beep/
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   Provided `strings` **must** be properly **escaped**.

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

    ```javascript
    // Unescaped:
    var re = reFromString( '/\w+/' );
    // returns /w+/

    // Escaped:
    re = reFromString( '/\\w+/' );
    // returns /\w+/
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

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

```javascript
var reFromString = require( '@stdlib/utils-regexp-from-string' );

var re = reFromString( '/beep/' );
// returns /beep/

re = reFromString( '/[A-Z]*/' );
// returns /[A-Z]*/

re = reFromString( '/\\\\\\\//ig' );
// returns /\\\//gi

re = reFromString( '/[A-Z]{0,}/' );
// returns /[A-Z]{0,}/

re = reFromString( '/^boop$/' );
// returns /^boop$/

re = reFromString( '/(?:.*)/' );
// returns /(?:.*)/

re = reFromString( '/(?:beep|boop)/' );
// returns /(?:beep|boop)/

re = reFromString( '/\\w+/' );
// returns /\w+/
```

</section>

<!-- /.examples -->

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

<section class="related">

</section>

<!-- /.related -->

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<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>

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

[test-image]: https://github.com/stdlib-js/utils-regexp-from-string/actions/workflows/test.yml/badge.svg?branch=v0.2.3
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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/utils-regexp-from-string/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-regexp-from-string/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-regexp-from-string/tree/umd
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[esm-url]: https://github.com/stdlib-js/utils-regexp-from-string/tree/esm
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[branches-url]: https://github.com/stdlib-js/utils-regexp-from-string/blob/main/branches.md

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

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

</section>

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