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RegExp.prototype.unicode - JavaScript | MDN
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RegExp.prototype.unicode

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2016 9.

unicode RegExp , u .

In this article

const regex1 = new RegExp("\u{61}");
const regex2 = new RegExp("\u{61}", "u");

console.log(regex1.unicode);
// Expected output: false

console.log(regex2.unicode);
// Expected output: true

console.log(regex1.source);
// Expected output: "a"

console.log(regex2.source);
// Expected output: "a"

RegExp.prototype.unicode u true , false. u . "u" .

  • (\u{xxxx}, \p{UnicodePropertyValue}) . , /\u{61}/u "a" , /\u{61}/ (u ) "u".repeat(61) , \u u .
  • . , /[]/u "" "\ud83d" .
  • lastIndex (: exec() ), UTF-16 .

( ). , .

unicode undefined. .

, u v . ( ) . u v , SyntaxError .

, u v . UTF-16 , .

unicode

js
const regex = /\u{61}/u;

console.log(regex.unicode); // true

Specification
ECMAScript 2027 LanguageSpecification
# sec-get-regexp.prototype.unicode

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  2. RegExp
    1. RegExp() constructor
    1. escape()
    1. RegExp.$1, , RegExp.$9
    2. input ($_)
    3. RegExp.lastMatch ($&)
    4. RegExp.lastParen ($+)
    5. RegExp.leftContext ($`)
    6. RegExp.rightContext ($')
    7. [Symbol.species]
    1. RegExp.prototype.compile()
    2. exec()
    3. RegExp.prototype.test()
    4. toString()
    5. [Symbol.match]()
    6. [Symbol.matchAll]()
    7. [Symbol.replace]()
    8. [Symbol.search]()
    9. [Symbol.split]()
    1. lastIndex
    2. RegExp.prototype.dotAll
    3. RegExp.prototype.flags
    4. RegExp.prototype.global
    5. RegExp.prototype.hasIndices
    6. RegExp.prototype.ignoreCase
    7. RegExp.prototype.multiline
    8. RegExp.prototype.source
    9. sticky
    10. RegExp.prototype.unicode
    11. RegExp.prototype.unicodeSets
  9. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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