JavaScript RegExp ?! Quantifier
Example
Do a global, case insensitive search for "is" not followed by " all":
let text = "Is this all there is";
let pattern = /is(?! all)/gi;
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
/(?!n)/ is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
Syntax
new RegExp("regexp(?!n)")
or
/regexp(?!n)/
Syntax with modifiers
new RegExp("regexp(?!n)", "g")
or simply:
/regexp(?!n)/g
