RegExp.lastParen ($+)

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.

Syntax

<var>RegExp</var>.lastParen
RegExp['$+']

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

Non-standard. Not part of any current specification.

Browser compatibility

See also

• RegExp.input ($_)
• RegExp.lastMatch ($&)
• RegExp.leftContext ($`)
• RegExp.rightContext ($')
• RegExp.$1-$9