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 input
property is a static property of regular expressions that contains the string against which a regular expression is matched. RegExp.$_
is an alias for this property.
Description
The input
property is static, it is not a property of an individual regular expression object. Instead, you always use it as RegExp.input
or RegExp.$_.
The value of the input
property is modified whenever the searched string on the regular expression is changed and that string is matching.
Examples
Using input
and $_
var re = /hi/g; re.test('hi there!'); RegExp.input; // "hi there!" re.test('foo'); // new test, non-matching RegExp.$_; // "hi there!" re.test('hi world!'); // new test, matching RegExp.$_; // "hi world!"
Specifications
Specification |
---|
Legacy RegExp features in JavaScript |
Browser compatibility
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
RegExp.input ($_ ) | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support 15 | Safari Full support 3 | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 14 | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
Legend
- Full support
- Full support
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.