RegExp static propertiesLimited availability
The RegExp object has several static properties to access the input and results of the most-recent regular expression match.
Not yet supported in all major browsers — check the table and provide a fallback.
Discouraged: The RegExp static properties may have unintended side effects.
Browser support
DesktopChrome
1+Supportedsince Dec 11, 2008
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1+Supportedsince Nov 9, 2004
Current: 157Safari
1–2Not supported
3+Supportedsince Oct 26, 2007
Current: 27MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1+Supportedsince Jun 29, 2007
Current: 27How to use
Support is still inconsistent across browsers. Use feature detection and test carefully.
Example
Full syntax and examples are on MDN: input.
Feature detection
JS · check before using
if ("input" in RegExp || ("prototype" in RegExp && "input" in RegExp.prototype)) {
// RegExp.input is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (6). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| RegExp.input | 1 | 12 | 1 | 3 | 18 | 4 | 1 |
| RegExp.lastMatch | 1 | 12 | 1 | 3 | 18 | 4 | 1 |
| RegExp.lastParen | 1 | 12 | 1 | 3 | 18 | 4 | 1 |
| RegExp.leftContext | 1 | 12 | 1 | 3 | 18 | 4 | 1 |
| RegExp.n | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| RegExp.rightContext | 1 | 12 | 1 | 3 | 18 | 4 | 1 |