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85 lines
1.9 KiB
Markdown
85 lines
1.9 KiB
Markdown
---
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date: 2020-11-06
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id: 5441479c-12e5-48c1-ab17-46a9c3df8bc3
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title: JavaScript RegExp Unicode Property Escapes
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---
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# Description
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Characters can be matched by mentioning their Unicode character
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properties inside of `\p{}`:
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# Proposal
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RegExp Unicode Property Escapes[^1]
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# Syntax
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``` javascript
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console.log(/^\p{White_Space}+$/u.test("\t \n\r")); // true
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console.log(/^\p{Script=Greek}+$/u.test("μετά")); // true
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```
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# Properties
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## Examples
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### Name
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A unique name, composed of uppercase letters, digits, hyphens and
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spaces.
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- A: Name = LATIN CAPITAL LETTER A
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- 🙂: Name = SLIGHTLY SMILING FACE
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### General~Category~
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categorizes characters
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- x: General~Category~ = Lowercase~Letter~
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- \$: General~Category~ = Currency~Symbol~
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### White~Scpace~
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Used for marking invisible spacing characters, such as spaces, tabs and
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newlines.
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- :͡ White~Space~ = True
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- π: White~Space~ = False
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### Age
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Version of the Unicode Standard in which a character was introduced. For
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example: The Euro sign € was added in version 2.1 of the Unicode
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standard.
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- €: Age = 2.1
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### Block
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A contiguous range of code points. Blocks don’t overlap and their names
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are unique.
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- S: Block = Basic~Latin~ (range U+0000..U+007F)
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- 🙂: Block = Emoticons (range U+1F600..U+1F64F)
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### Script
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A collection of characters used by one or more writing systems.
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- Some scripts support several writing systems. For example, the Latin
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script supports the writing systems English, French, German, Latin,
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etc.
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- Some languages can be written in multiple alternate writing systems
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that are supported by multiple scripts. For example, Turkish used
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the Arabic script before it transitioned to the Latin script in the
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early 20th century.
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1. Examples
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- α: Script = Greek
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- Д: Script = Cyrillic
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# Footnotes
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[^1]: <https://github.com/tc39/proposal-regexp-unicode-property-escapes>
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