Regex Tester & Validator

This regular expression matches the exact domain names for ESET Inspect Cloud HTTP agents across different regions, specifically Europe (`eu01`), the United States (`us01`), and Japan (`jp01`). It ensures that the target string strictly conforms to the format of `[region]01.agent.edr.eset.systems` by using start and end anchors. This pattern is highly useful for network monitoring, firewall rules, and log parsing to track or allow traffic destined for the ESET EDR infrastructure.