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

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<details>
  <summary>
    About stdlib...
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# reColorHexadecimal

[![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][mdn-regexp] to match a hexadecimal color.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var reColorHexadecimal = require( '@stdlib/regexp-color-hexadecimal' );
```

#### reColorHexadecimal( \[mode] )

Returns a [regular expression][mdn-regexp] to match a full hexadecimal color.

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

var bool = RE.test( 'ffffff' );
// returns true

bool = RE.test( '000' );
// returns false
```

To return a [regular expression][mdn-regexp] that matches a shorthand hexadecimal color, set the `mode` argument to `shorthand`.

```javascript
var RE = reColorHexadecimal( 'shorthand' );
// returns <RegExp>

var bool = RE.test( '000' );
// returns true
```

To return a [regular expression][mdn-regexp] that matches **either** a shorthand or a full length hexadecimal color, set the `mode` argument to `either`.

```javascript
var RE = reColorHexadecimal( 'either' );
// returns <RegExp>

var bool = RE.test( '000' );
// returns true
```

#### reColorHexadecimal.REGEXP

[Regular expression][mdn-regexp] to match a full length hexadecimal color.

```javascript
var bool = reColorHexadecimal.REGEXP.test( 'ffffff' );
// returns true

bool = reColorHexadecimal.REGEXP.test( '000' );
// returns false
```

#### reColorHexadecimal.REGEXP_SHORTHAND

[Regular expression][mdn-regexp] to match a shorthand hexadecimal color.

```javascript
var bool = reColorHexadecimal.REGEXP_SHORTHAND.test( 'ffffff' );
// returns false

bool = reColorHexadecimal.REGEXP_SHORTHAND.test( '000' );
// returns true
```

#### reColorHexadecimal.REGEXP_EITHER

[Regular expression][mdn-regexp] to match **either** a shorthand or a full length hexadecimal color.

```javascript
var bool = reColorHexadecimal.REGEXP_EITHER.test( 'ffffff' );
// returns true

bool = reColorHexadecimal.REGEXP_EITHER.test( '000' );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

```javascript
var isString = require( '@stdlib/assert-is-string' ).isPrimitive;
var reColorHexadecimal = require( '@stdlib/regexp-color-hexadecimal' );

function isHexColor( value, mode ) {
    if ( !isString( value ) ) {
        return false;
    }
    if ( mode === 'shorthand' ) {
        return reColorHexadecimal.REGEXP_SHORTHAND.test( value );
    }
    if ( mode === 'either' ) {
        return reColorHexadecimal.REGEXP_EITHER.test( value );
    }
    return reColorHexadecimal.REGEXP.test( value );
}

var bool = isHexColor( 'ffffff', 'full' );
// returns true

bool = isHexColor( '474747', 'either' );
// returns true

bool = isHexColor( '0A5BBE', 'shorthand' );
// returns false

bool = isHexColor( '000', 'full' );
// returns false

bool = isHexColor( '000', 'either' );
// returns true

bool = isHexColor( 'F7b', 'shorthand' );
// returns true

bool = isHexColor( 'abcd', 'either' );
// returns false

bool = isHexColor( '', 'either' );
// returns false

bool = isHexColor( null, 'either' );
// returns false
```

</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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[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-color-hexadecimal/tree/deno
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/regexp-color-hexadecimal/main/LICENSE

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

</section>

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