The option that uses regex to create a detection or take a preventative action is Custom IOA. A Custom IOA (indicator of attack) allows you to define custom rules for detecting or preventing suspicious behavior based on process execution, file write, network connection, or registry events. You can use regex syntax to create a Custom IOA rule that matches the event data that you want to monitor or block1.

References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike