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# unicode-match-property-value-ecmascript [](https://travis-ci.org/mathiasbynens/unicode-match-property-value-ecmascript) [](https://www.npmjs.com/package/unicode-match-property-value-ecmascript)
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_unicode-match-property-value-ecmascript_ matches a given Unicode property value or [property value alias](https://github.com/mathiasbynens/unicode-property-value-aliases) to its canonical property value without applying [loose matching](https://github.com/mathiasbynens/unicode-loose-match), per the algorithm used for [RegExp Unicode property escapes in ECMAScript](https://github.com/tc39/proposal-regexp-unicode-property-escapes). Consider it a strict alternative to loose matching.
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## Installation
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To use _unicode-match-property-value-ecmascript_ programmatically, install it as a dependency via [npm](https://www.npmjs.com/):
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```bash
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$ npm install unicode-match-property-value-ecmascript
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```
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Then, `require` it:
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```js
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const matchPropertyValue = require('unicode-match-property-value-ecmascript');
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```
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## API
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This module exports a single function named `matchPropertyValue`.
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### `matchPropertyValue(property, value)`
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This function takes a string `property` that is a canonical/unaliased Unicode property name, and a string `value`. It attemps to match `value` to a canonical Unicode property value for the given property. If there’s a match, it returns the canonical property value. Otherwise, it throws an exception.
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```js
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// Find the canonical property value:
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matchPropertyValue('Script_Extensions', 'Aghb')
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// → 'Caucasian_Albanian'
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matchPropertyValue('Script_Extensions', 'Caucasian_Albanian')
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// → 'Caucasian_Albanian'
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matchPropertyValue('script_extensions', 'Caucasian_Albanian') // Note: incorrect casing.
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// → throws
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matchPropertyValue('Script_Extensions', 'caucasian_albanian') // Note: incorrect casing.
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// → throws
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```
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## For maintainers
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### How to publish a new release
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1. On the `main` branch, bump the version number in `package.json`:
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```sh
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npm version patch -m 'Release v%s'
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```
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Instead of `patch`, use `minor` or `major` [as needed](https://semver.org/).
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Note that this produces a Git commit + tag.
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1. Push the release commit and tag:
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```sh
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git push && git push --tags
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```
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Our CI then automatically publishes the new release to npm.
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## Author
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| [](https://twitter.com/mathias "Follow @mathias on Twitter") |
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| [Mathias Bynens](https://mathiasbynens.be/) |
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## License
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_unicode-match-property-value-ecmascript_ is available under the [MIT](https://mths.be/mit) license.
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