RegExp.lastParen ($+)
Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The non-standard lastParen
property is a static and read-only property of regular expressions that contains the last parenthesized substring match, if any. RegExp.$+
is an alias for this property.
Description
The lastParen
property is static, it is not a property of an individual regular expression object. Instead, you always use it as RegExp.lastParen
or RegExp['$+']
.
The value of the lastParen
property is read-only and modified whenever a successful match is made.
You can not use the shorthand alias with the dot property accessor (RegExp.$+
), because the parser expects an expression with "+" in that case and a SyntaxError
is thrown. Use the bracket notation for property access.
Examples
Using lastParen and $+
var re = /(hi)/g;
re.test('hi there!');
RegExp.lastParen; // "hi"
RegExp['$+']; // "hi"
Specifications
No specification found
No specification data found for javascript.builtins.RegExp.lastParen
.
Check for problems with this page or contribute a missing spec_url
to mdn/browser-compat-data. Also make sure the specification is included in w3c/browser-specs.
Browser compatibility
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