Explanation
The best way to update the workflow is to add a parallel action to send a custom email to your CISO. A parallel action allows you to perform multiple actions simultaneously when a workflow is triggered, without affecting the order or outcome of other actions. A sequential action, on the other hand, requires one action to complete before another action can start. By adding a parallel action, you can ensure that both the escalation team and your CISO receive an email notification as soon as possible1.
References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike

Explanation
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

Explanation
Scheduling a Custom Alert for your environment consists of three steps: choosing the template you'd like to configure, previewing the search results, then scheduling the alert. Use Custom Alerts to configure email alerts using predefined templates so you're notified about specific activity in your environment. When an alert runs and finds results, it sends an email to specified recipients instead of generating a new detection. Custom Alerts let you set up email alerts based on predefined templates that cover a wide range of topics including Real Time Response session initiation, host containment, OS security settings, and more that are not yet covered by notification workflows.