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JavaScript RegExp ?! Quantifier

RegExp Object Reference JavaScript RegExp Object

Example

Do a global, case insensitive search for "is" not followed by " all":

var str = "Is this all there is";
var patt1 = /is(?! all)/gi;

The marked text below shows where the expression gets a match:

Is this all there is

Try it yourself »

Definition and Usage

The ?!n quantifier matches any string that is not followed by a specific string n.

Tip: Use the ?=n quantifier to match any string that IS followed by a specific string n.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The ?! quantifier is supported in all major browsers.


Syntax

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

or

/regexp(?!n)/

Syntax with modifiers

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

or simply:

/\regexp(?!n)/g


RegExp Object Reference JavaScript RegExp Object

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