regexFilter is a generic term used across programming languages, log systems, and web APIs to describe a mechanism that uses Regular Expressions (Regex) to isolate, include, or discard data based on text patterns.
While it exists as a configuration class in many enterprise tools like Apache Log4j and Google Security Operations, its most prominent modern usage is in the chrome.declarativeNetRequest API for building Manifest V3 browser extensions. 1. Browser Extensions (declarativeNetRequest)
In modern Chromium and Firefox extension development, regexFilter is a condition parameter used to block, redirect, or modify web network requests. Rather than intercepting requests in heavy JavaScript, the browser compiles the regex pattern directly for maximum efficiency and user privacy. Regex Filter transform – IBM
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