Regex : "?!" not working in Grafana 8.4.3

I want to exclude all "/boot" from my supervison. For that, I use this regex : /.*(?!boot): Space utilization/ but it doesn't work. If I want see just the "/boot" partition, I use this regex : /.*(?:boot): Space utilization/ and this it's work.

Why the exculde caraceters it's doesn't work ? Is the syntax correct ?

Thank you for your feedback

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