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.$' is an alias for this property.
rightContext property is static, it is not a property of an individual regular expression object. Instead, you always use it as
The value of the
rightContext property is read-only and modified whenever a successful match is made.
You can not use the shorthand alias with the dot property accessor (
RegExp.$'), because the parser expects a starting string in that case and a
SyntaxError is thrown. Use the bracket notation for property access.
const re = /hello/g; re.test("hello world!"); RegExp.rightContext; // " world!" RegExp["$'"]; // " world!"
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