The RegExp object has several static properties to access the input and results of the most-recent regular expression match.

Learning resources on MDN

• RegExp.input ($_)
• RegExp.lastMatch ($&)
• RegExp.lastParen ($+)
• RegExp.leftContext ($`)
• RegExp.$1, …, RegExp.$9
• RegExp.rightContext ($')

Browser support

• Chrome 1 Released on 2008-12-11
• Chrome Android 18 Released on 2012-06-27
• Edge 12 Released on 2015-07-29
• Firefox 1 Released on 2004-11-09
• Firefox for Android 4 Released on 2011-03-29
• Safari 3 Released on 2007-10-26
• Safari on iOS 1 Released on 2007-06-29

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