The behavior of JavaScript replace varies between Chrome and IE

This JavaScript code successfully replaces a string in Chrome:

myUrl = someUrl.replace('%2C%7B%22itn%22%3A%5B%22%20guidelines%20%22%5D%7D', '');

However, when tested in Internet Explorer, it does not replace the string as expected.

The issue seems to be related to how IE handles %22, where debugging the code and replacing %22 with " temporarily resolves the problem. But making that change within the script causes errors in both Chrome and IE.

How can I modify this script to ensure cross-browser compatibility?

javascriptinternet-explorergoogle-chrome

Answer №1

This issue has been reported as a well-known vulnerability in Internet Explorer where it fails to properly encode quotation marks (") within the query string of a URL. To avoid potential security risks, it is recommended to replace URLs that contain both %22 and ".

One solution involves using a JavaScript regular expression like so: 

newUrl = originalUrl.replace(/%2C%7B%22itn(?:%22|")%3A%5B(?:%22|")%20guidelines%20(?:%22|")%5D%7D/, '');

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