npm package: @stdlib/regexp-native-function
Description: Return a regular expression to match a native function.
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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</details>

# reNativeFunction

[![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 match a native function.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var reNativeFunction = require( '@stdlib/regexp-native-function' );
```

#### reNativeFunction()

Returns a [regular expression][regexp] to match a native `function`.

```javascript
var RE_NATIVE_FUNCTION = reNativeFunction();
var bool = RE_NATIVE_FUNCTION.test( Date.toString() );
// returns true
```

#### reNativeFunction.REGEXP

[Regular expression][regexp] to match a native `function`.

```javascript
var bool = reNativeFunction.REGEXP.test( Date.toString() );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable no-restricted-syntax, no-empty-function, stdlib/no-builtin-math -->

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

```javascript
var Int8Array = require( '@stdlib/array-int8' );
var reNativeFunction = require( '@stdlib/regexp-native-function' );

var RE_NATIVE_FUNCTION = reNativeFunction();
function isNativeFunction( fcn ) {
    return RE_NATIVE_FUNCTION.test( fcn.toString() );
}

var bool = isNativeFunction( Math.sqrt );
// returns true

bool = isNativeFunction( String );
// returns true

bool = isNativeFunction( Int8Array );
// returns true

bool = isNativeFunction( Date );
// returns true

bool = isNativeFunction( function noop() {} );
// 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/regexp-function-name`][@stdlib/regexp/function-name]</span><span class="delimiter">: </span><span class="description">return a regular expression to capture a function name.</span>
-   <span class="package-name">[`@stdlib/utils-function-name`][@stdlib/utils/function-name]</span><span class="delimiter">: </span><span class="description">determine a function's name.</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-native-function.svg
[npm-url]: https://npmjs.org/package/@stdlib/regexp-native-function

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

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/regexp-native-function/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/regexp-native-function?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-native-function/tree/deno
[deno-readme]: https://github.com/stdlib-js/regexp-native-function/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/regexp-native-function/tree/umd
[umd-readme]: https://github.com/stdlib-js/regexp-native-function/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/regexp-native-function/tree/esm
[esm-readme]: https://github.com/stdlib-js/regexp-native-function/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/regexp-native-function/blob/main/branches.md

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

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

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

[@stdlib/regexp/function-name]: https://www.npmjs.com/package/@stdlib/regexp-function-name

[@stdlib/utils/function-name]: https://www.npmjs.com/package/@stdlib/utils-function-name

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

</section>

<!-- /.links -->