image-rights-html-generator/node_modules/emoji-regex/README.md

138 lines
4.4 KiB
Markdown
Raw Normal View History

2024-06-03 21:21:41 +00:00
# emoji-regex [![Build status](https://travis-ci.org/mathiasbynens/emoji-regex.svg?branch=main)](https://travis-ci.org/mathiasbynens/emoji-regex)
_emoji-regex_ offers a regular expression to match all emoji symbols and sequences (including textual representations of emoji) as per the Unicode Standard.
This repository contains a script that generates this regular expression based on [Unicode data](https://github.com/node-unicode/node-unicode-data). Because of this, the regular expression can easily be updated whenever new emoji are added to the Unicode standard.
## Installation
Via [npm](https://www.npmjs.com/):
```bash
npm install emoji-regex
```
In [Node.js](https://nodejs.org/):
```js
const emojiRegex = require('emoji-regex/RGI_Emoji.js');
// 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 = `
\u{231A}: ⌚ default emoji presentation character (Emoji_Presentation)
\u{2194}\u{FE0F}: ↔️ default text presentation character rendered as emoji
\u{1F469}: 👩 emoji modifier base (Emoji_Modifier_Base)
\u{1F469}\u{1F3FF}: 👩🏿 emoji modifier base followed by a modifier
`;
const regex = emojiRegex();
let match;
while (match = regex.exec(text)) {
const emoji = match[0];
console.log(`Matched sequence ${ emoji } — code points: ${ [...emoji].length }`);
}
```
Console output:
```
Matched sequence ⌚ — code points: 1
Matched sequence ⌚ — code points: 1
Matched sequence ↔️ — code points: 2
Matched sequence ↔️ — code points: 2
Matched sequence 👩 — code points: 1
Matched sequence 👩 — code points: 1
Matched sequence 👩🏿 — code points: 2
Matched sequence 👩🏿 — code points: 2
```
## Regular expression flavors
The package comes with three distinct regular expressions:
```js
// This is the recommended regular expression to use. It matches all
// emoji recommended for general interchange, as defined via the
// `RGI_Emoji` property in the Unicode Standard.
// https://unicode.org/reports/tr51/#def_rgi_set
// When in doubt, use this!
const emojiRegexRGI = require('emoji-regex/RGI_Emoji.js');
// This is the old regular expression, prior to `RGI_Emoji` being
// standardized. In addition to all `RGI_Emoji` sequences, it matches
// some emoji you probably dont want to match (such as emoji component
// symbols that are not meant to be used separately).
const emojiRegex = require('emoji-regex/index.js');
// This regular expression matches even more emoji than the previous
// one, including emoji that render as text instead of icons (i.e.
// emoji that are not `Emoji_Presentation` symbols and that arent
// forced to render as emoji by a variation selector).
const emojiRegexText = require('emoji-regex/text.js');
```
Additionally, in environments which support ES2015 Unicode escapes, you may `require` ES2015-style versions of the regexes:
```js
const emojiRegexRGI = require('emoji-regex/es2015/RGI_Emoji.js');
const emojiRegex = require('emoji-regex/es2015/index.js');
const emojiRegexText = require('emoji-regex/es2015/text.js');
```
## For maintainers
### How to update emoji-regex after new Unicode Standard releases
1. Update the Unicode data dependency in `package.json` by running the following commands:
```sh
# Example: updating from Unicode v12 to Unicode v13.
npm uninstall @unicode/unicode-12.0.0
npm install @unicode/unicode-13.0.0 --save-dev
````
1. Generate the new output:
```sh
npm run build
```
1. Verify that tests still pass:
```sh
npm test
```
1. Send a pull request with the changes, and get it reviewed & merged.
1. On the `main` branch, bump the emoji-regex version number in `package.json`:
```sh
npm version patch -m 'Release v%s'
```
Instead of `patch`, use `minor` or `major` [as needed](https://semver.org/).
Note that this produces a Git commit + tag.
1. Push the release commit and tag:
```sh
git push
```
Our CI then automatically publishes the new release to npm.
## Author
| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
|---|
| [Mathias Bynens](https://mathiasbynens.be/) |
## License
_emoji-regex_ is available under the [MIT](https://mths.be/mit) license.