ES2015 RegExp subclassing semantics

This feature allows RegExp subclasses to override RegExp.prototype.exec and flags to change the semantics of higher-level functionality, such as String.prototype.replace. Previous JavaScript versions always used the original value of exec from replace. This feature makes it easier to implement new RegExp subclasses by changing a single core piece, without duplicating the higher level integration logic.

Status in Chromium

Blink components: Blink

Enabled by default (launch bug) in:

• Chrome for desktop release 51
• Chrome for Android release 51
• Android WebView release 51
• Opera release 38
• Opera for Android release 38

Consensus & Standardization

• Firefox: In development
• Edge: In development
• Safari: In development
• Web Developers: No signals

Owners

• littledan@chromium.org
• adamk@chromium.org

Last updated on 2017-06-14