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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.
Lookbehind in JS regular expressions on 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.
Lookbehind in JS regular expressions on 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.
Lookbehind in JS regular expressions on Opera Mobile is fully supported on 64-73, partially supported on None of the versions, and not supported on 10-12 Opera Mobile versions.
Lookbehind in JS regular expressions on 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.
Lookbehind in JS regular expressions on 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.
Lookbehind in JS regular expressions on 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