[RELEASE] Google Calendar, Task, and Gmail Search and Gmail Notification Device

Unfortunately this functionality isn't going to work for your use case. Instead you could use Rule Machine to trigger on changes to your child switch eventTitle and extract your value via token function but the fact your string has a % in it will cause problems. Know you mention your words tend to vary but I would recommend standardizing them or choose something other than % as a delimiter.

See this article on how to extract token from strings:

Here is an example where I changed your % to a : and the rule properly extracted the 100 from the string, ignore the "phone number" as I reused an existing string variable I have on my dev hub.

Variable value:

Note the rule trigger is eventTitle does not equal a space " ". When no event is found by the search trigger the app sets all state variables to a single space. So you can catch this by looking for eventTitle != " "