Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The non-standard rightContext property is a static and read-only property of regular expressions that contains the substring following the most recent match. RegExp.$' is an alias for this property.
Syntax
RegExp.rightContext
RegExp["$'"]
Description
The rightContext property is static, it is not a property of an individual regular expression object. Instead, you always use it as RegExp.rightContext or RegExp["$'"].
The value of the rightContext property is read-only and modified whenever a successful match is made.
You can not use the shorthand alias with the dot property accessor (RegExp.$'), because the parser expects a starting string in that case and a SyntaxError is thrown. Use the bracket notation for property access.
Examples
Using rightContext and $'
var re = /hello/g;
re.test('hello world!');
RegExp.rightContext; // " world!"
RegExp["$'"]; // " world!"
Specifications
Non-standard. Not part of any current specification.
Browser compatibility
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | Yes | Yes | 1 | Yes | Yes | Yes |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | Yes | Yes | Yes | 4 | Yes | Yes | Yes |