RegExp.input ($_)

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

Browser compatibility

See also

• RegExp.lastMatch ($&)
• RegExp.lastParen ($+)
• RegExp.leftContext ($`)
• RegExp.rightContext ($')
• RegExp.$1-$9