Yes, so it looks like you are using a rex that looks for a string "name=" followed by characters that aren't commas. "name=(?<MyFileName>[^,]*)" So if given an event like
age=23,name=billy,height=tall
It would pull a field MyFileName of "billy". I know the example ended up silly, but that's OK. 🙂
But your initial pasting of events shows they look like
age=23&name=billy&height=tall
So you need to make sure you are looking for the string "name=" then characters up to but not including an ampersand. Like "name=(?<MyFileName>[^&]*)" .
Unless the initial pastes were of the wrong data or got funged up during pasting. So in either way, if you have further problems if you could paste in new event samples that would be great. Of course, we'll just hope it all works!
BTW, I put this stuff up into regex101.com so you can see how it determined what was matching, and this is off the original data way up in the question.
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