RegExp.lastParen ($+)

Deprecated

Avoid using this feature in new projects. The RegExp static properties may have unintended side effects. This feature may be a candidate for removal from web standards or browsers.

: RegExp RegExp

RegExp.lastParen RegExp["$+"]

lastParen RegExp RegExp RegExp.lastParen RegExp["$+"]

lastParen RegExp RegExp lastParen lastParen undefined

(RegExp.$+) + SyntaxError

lastParen $+

const re = /(hi)/g;
re.test("hi there!");
RegExp.lastParen; // "hi"
RegExp["$+"]; // "hi"


Legacy RegExp features # additional-properties-of-the-regexp-constructor

RegExp.input ($_)
RegExp.lastMatch ($&)
RegExp.leftContext ($`)
RegExp.rightContext ($')
RegExp.$1, , RegExp.$9

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MDN 20251110

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RegExp
1. RegExp()
1. escape()
Object/Function
1. __proto__
2. constructor