JavaScript RegExp ?! Quantifier

Definition and usage

?!n Quantifiers to match any string that is not immediately followed by a specified string n string.

Tip:Use ?=n Quantifiers to match any string that is immediately followed by a specified string n string.

Example

Search globally and case-insensitively for "is", not immediately followed by "all":

let text = "Is this all there is";
let pattern = /is(?! all)/gi;

Try it yourself

Syntax

new RegExp("regexp(?!n)\)

or abbreviated:

/regexp(?!n)/

Syntax with modifiers

new RegExp("regexp(?!n)\"g\")

or abbreviated:

/regexp(?!n)/g

browser supports

/(?!n)/ 是 ECMAScript1 (ES1) 特性。

所有浏览器都完全支持 ES1 (JavaScript 1997)：

Chrome IE Edge Firefox Safari Opera
支持 支持 支持 支持 支持 支持