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Lookbehind in JS regular expressions

In JavaScript regular expressions, the positive lookbehind ?<= and negative lookbehind ?<! zero-width assertions can be used to confirm that one pattern is followed by another.

Last updated on : 2023-03-20

Browser Versions

Edge

Firefox

Chrome

Safari

Opera

5.5 - 11

12 - 18

79 - 111

2 - 77

78 - 113

4 - 61

62 - 114

3.2 - 16.3

16.4 - 16.4

9.5 - 48

49 - 95

Fully Supported

Partially

No Support

Browser Compatibility

Lookbehind in JS regular expressions on IE is not supported on any IE versions.

Lookbehind in JS regular expressions on Edge is fully supported on 79-111, and not supported on 12-18 Edge versions.

Lookbehind in JS regular expressions on Firefox is fully supported on 78-113, and not supported on 2-77 Firefox versions.

Lookbehind in JS regular expressions on Chrome is fully supported on 62-114, and not supported on 4-61 Chrome versions.

Lookbehind in JS regular expressions on Safari is fully supported on 16.4-16.4, and not supported on 3.2-16.3 Safari versions.

Lookbehind in JS regular expressions on Opera is fully supported on 49-95, and not supported on 9.5-48 Opera versions.

Lookbehind in JS regular expressions on Safari on iOS is fully supported on 16.4-16.4, and not supported on 3.2-16.3 Safari on iOS versions.

Lookbehind in JS regular expressions on Android Browser is fully supported on 97-111, and not supported on 2.1-4 Android Browser versions.

Lookbehind in JS regular expressions on Opera Mobile is fully supported on 64-73, and not supported on 10-12 Opera Mobile versions.

Lookbehind in JS regular expressions on Chrome for Android is fully supported on all Chrome for Android versions.

Lookbehind in JS regular expressions on Firefox for Android is fully supported on all Firefox for Android versions.

Lookbehind in JS regular expressions on Samsung Internet is fully supported on 8.2-20, and not supported on 4-7.2 Samsung Internet versions.

Browser Support for Lookbehind in JS regular expressions

Lookbehind in JS regular expressions on Chrome

Lookbehind in JS regular expressions on Safari

Lookbehind in JS regular expressions on Firefox

Lookbehind in JS regular expressions on Internet Explorer

Lookbehind in JS regular expressions on Opera

Lookbehind in JS regular expressions on Edge

References

Data sourced from

High

Overall Browser Compatibility Score

Note:Lookbehind in JS regular expressions shows a browser compatibility score of 75. This is a collective score out of 100 to represent browser support of a web technology. The higher this score is, the greater is the browser compatibility. The browser compatibility score is not a 100% reflection for every browser and the web technology support. However, it does give you an estimate on how much you should rely on a particular web technology in terms of browser compatibility.

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