https://github.com/mathiasbynens/hashtag-regex

A regular expression to match hashtag identifiers as per the Unicode Standard.
https://github.com/mathiasbynens/hashtag-regex

emoji hashtag regex regexp regular-expression unicode

Last synced: 1 day ago
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A regular expression to match hashtag identifiers as per the Unicode Standard.

• Host: GitHub
• URL: https://github.com/mathiasbynens/hashtag-regex
• Owner: mathiasbynens
• License: mit
• Created: 2017-03-30T10:31:28.000Z (almost 8 years ago)
• Default Branch: main
• Last Pushed: 2023-10-21T10:19:44.000Z (about 1 year ago)
• Last Synced: 2024-12-23T17:11:57.281Z (8 days ago)
• Topics: emoji, hashtag, regex, regexp, regular-expression, unicode
• Language: JavaScript
• Size: 10.7 KB
• Stars: 59
• Watchers: 4
• Forks: 8
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-MIT.txt

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README

        
# hashtag-regex [![Build status](https://travis-ci.org/mathiasbynens/hashtag-regex.svg?branch=master)](https://travis-ci.org/mathiasbynens/hashtag-regex)

_hashtag-regex_ offers a regular expression to match hashtag identifiers [as per the Unicode Standard](http://unicode.org/reports/tr31/#hashtag_identifiers).

This repository contains a script that generates this regular expression based on the Unicode data. Because of this, the regular expression can easily be updated whenever the Unicode Standard changes.

## Installation

Via [npm](https://www.npmjs.com/):

```bash

npm install hashtag-regex

```

In [Node.js](https://nodejs.org/):

```js

const hashtagRegex = require('hashtag-regex');

// Note: because the regular expression has the global flag set, this module

// exports a function that returns the regex rather than exporting the regular

// expression itself, to make it impossible to (accidentally) mutate the

// original regular expression.

const text = `

#hashtag

#©

＃🤷🏿‍♀️ (\uFF03\u{1F937}\u{1F3FF}\u200D\u2640\uFE0F)

`;

const regex = hashtagRegex();

let match;

while (match = regex.exec(text)) {

  const hashtag = match[0];

  console.log(`Matched sequence ${ hashtag } — code points: ${ [...hashtag].length }`);

}

```

Console output:

```

Matched sequence #hashtag — code points: 8

Matched sequence #© — code points: 2

Matched sequence ＃🤷🏿‍♀️ — code points: 6

Matched sequence ＃🤷🏿‍♀️ — code points: 6

```

## Author

| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |

|---|

| [Mathias Bynens](https://mathiasbynens.be/) |

## License

_hashtag-regex_ is available under the [MIT](https://mths.be/mit) license.