This utility variable validates the format of the incoming event name and its parameter keys. It returns true if the event name contains any characters other than letters, numbers, and underscores (_), or if a parameter key contains any characters other than letters, numbers, underscores (_), and hyphens (-).
This flag is useful for detecting and diverting potentially malicious traffic, such as an injection attack, before it is processed by your server-side tags.
Alternatively, this can be used as a simple check for misconfigured event parameter keys or event names.