npm package: @stdlib/regexp-dirname
Description: Return a regular expression to capture a path dirname.
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>
  <p>The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.</p>
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</details>

# reDirname

[![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 capture a path [dirname][dirname].

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### reDirname( \[platform] )

Returns a [regular expression][regexp] to capture a path [dirname][dirname].

```javascript
var RE = reDirname();
// returns <RegExp>

RE = reDirname( 'posix' );
// returns <RegExp>

var dir = RE.exec( '/foo/bar/index.js' )[ 1 ];
// returns '/foo/bar'

RE = reDirname( 'win32' );
// returns <RegExp>

dir = RE.exec( 'C:\\foo\\bar\\index.js' )[ 1 ];
// returns 'C:\foo\bar'
```

#### reBasename.REGEXP

[Regular expression][regexp] to capture a path dirname.

```javascript
var bool = ( reDirname.REGEXP.toString() === reDirname().toString() );
// returns true
```

#### reDirname.REGEXP_POSIX

[Regular expression][@stdlib/regexp/dirname-posix] to capture a [POSIX][posix] path dirname.

```javascript
var dir = reDirname.REGEXP_POSIX.exec( '/foo/bar/index.js' )[ 1 ];
// returns '/foo/bar'
```

#### reDirname.REGEXP_WIN32

[Regular expression][@stdlib/regexp/dirname-windows] to capture a Windows path dirname.

```javascript
var dir = reDirname.REGEXP_WIN32.exec( 'C:\\foo\\bar\\index.js' )[ 1 ];
// returns 'C:\foo\bar'
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The as `REGEXP` exported [regular expression][regexp] is [platform][@stdlib/assert/is-windows]-dependent. If the current process is running on Windows, `REGEXP === REGEXP_WIN32`; otherwise, `REGEXP === REGEXP_POSIX`.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var reDirname = require( '@stdlib/regexp-dirname' );
var RE_DIRNAME = reDirname();
var dir;

// Assuming a POSIX platform...
dir = RE_DIRNAME.exec( '/foo/bar/index.js' )[ 1 ];
// returns '/foo/bar'

dir = reDirname.REGEXP_POSIX.exec( '/foo/bar/home.html' )[ 1 ];
// returns '/foo/bar'

dir = reDirname.REGEXP_WIN32.exec( 'C:\\foo\\bar\\home.html' )[ 1 ];
// returns 'C:\foo\bar'
```

</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-dirname-posix`][@stdlib/regexp/dirname-posix]</span><span class="delimiter">: </span><span class="description">return a regular expression to capture a POSIX path dirname.</span>
-   <span class="package-name">[`@stdlib/regexp-dirname-windows`][@stdlib/regexp/dirname-windows]</span><span class="delimiter">: </span><span class="description">return a regular expression to capture a Windows path dirname.</span>
-   <span class="package-name">[`@stdlib/utils-dirname`][@stdlib/utils/dirname]</span><span class="delimiter">: </span><span class="description">return a directory 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-dirname.svg
[npm-url]: https://npmjs.org/package/@stdlib/regexp-dirname

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

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

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

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

[dirname]: https://en.wikipedia.org/wiki/Dirname

[posix]: https://en.wikipedia.org/wiki/POSIX

[@stdlib/assert/is-windows]: https://www.npmjs.com/package/@stdlib/assert-is-windows

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

[@stdlib/regexp/dirname-posix]: https://www.npmjs.com/package/@stdlib/regexp-dirname-posix

[@stdlib/regexp/dirname-windows]: https://www.npmjs.com/package/@stdlib/regexp-dirname-windows

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

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

</section>

<!-- /.links -->