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Lookbehind in JS regular expressions

Last updated on : 2023-03-20

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.

Overview

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.

Code snippets

js-regexp-lookbehind.html

Source:js-regexp-lookbehind.html

index.html

Source:index.html

Browser Compatibility

Lookbehind in JS regular expressions on IE is fully supported on None of the versions, partially supported on None of the versions, and not supported on 5.5-11 IE versions.
Lookbehind in JS regular expressions on Edge is fully supported on 79-111, partially supported on None of the versions, and not supported on 12-18 Edge versions.
Lookbehind in JS regular expressions on Firefox is fully supported on 78-113, partially supported on None of the versions, and not supported on 2-77 Firefox versions.
Lookbehind in JS regular expressions on Chrome is fully supported on 62-114, partially supported on None of the versions, and not supported on 4-61 Chrome versions.
Lookbehind in JS regular expressions on Safari is fully supported on 16.4-16.4, partially supported on None of the versions, and not supported on 3.2-16.3 Safari versions.
Lookbehind in JS regular expressions on Opera is fully supported on 49-95, partially supported on None of the versions, and not supported on 9.5-48 Opera versions.
Safari on iOS is fully supported on 16.4-16.4, partially supported on None of the versions, and not supported on 3.2-16.3 Safari on iOS versions.
Android Browser is fully supported on 97-111, partially supported on None of the versions, and not supported on 2.1-4 Android Browser versions.
Opera Mobile is fully supported on 64-73, partially supported on None of the versions, and not supported on 10-12 Opera Mobile versions.
Chrome for Android is fully supported on 97-111, partially supported on None of the versions, and not supported on below 97 Chrome for Android versions.
Firefox for Android is fully supported on 95-110, partially supported on None of the versions, and not supported on below 95 Firefox for Android versions.
Samsung Internet is fully supported on 8.2-20, partially supported on None of the versions, and not supported on 4-7.2 Samsung Internet versions.

High

Browser Compatibility Score

Low

Browser Support For IE Versions

Fully

Partially

5.5-11

No Support

Edge

High

Browser Support For Edge Versions

79-111

Fully

Partially

12-18

No Support

Firefox

High

Browser Support For Firefox Versions

78-113

Fully

Partially

2-77

No Support

Chrome

High

Browser Support For Chrome Versions

62-114

Fully

Partially

4-61

No Support

Safari

Low

Browser Support For Safari Versions

16.4-16.4

Fully

Partially

3.2-16.3

No Support

Opera

High

Browser Support For Opera Versions

49-95

Fully

Partially

9.5-48

No Support

Safari on iOS

Low

Browser Support For Safari on iOS Versions

16.4-16.4

Fully

Partially

3.2-16.3

No Support

Android Browser

High

Browser Support For Android Browser Versions

97-111

Fully

Partially

2.1-4

No Support

Opera Mobile

High

Browser Support For Opera Mobile Versions

64-73

Fully

Partially

10-12

No Support

Chrome for Android

High

Browser Support For Chrome for Android Versions

97-111

Fully

Partially

No Support

Firefox for Android

High

Browser Support For Firefox for Android Versions

95-110

Fully

Partially

No Support

Samsung Internet

High

Browser Support For Samsung Internet Versions

8.2-20

Fully

Partially

4-7.2

No Support

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Last Modified date

2023-03-20