How to test server side fingerprint?

I have the following test cases that happened with me:

I would like to group all events where the exception value doesn’t start with

But it’s really bad to test this case due to the quotation marks symbols in the string and having to send a new event to check if it’s filtering correctly.

So my questions are, is there an easy way for testing the server side fingerprint that I made using an existing event ? (to see if it’s going to work or not)
Does server side fingerprint supports not operation? like if a exception doesn’t contain ‘aaa’, but ‘bbb’ group to fingerbbb.