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Thank you, That was my workaround, but now I am sure it is not exist with negation.

Hi, Quastion: Is it possible to check if header do not exist or not match X-Key: QWeqweQWE123 Action: Notify From: Domain: example.com To: Domain: example.com What Object: (I have a problem here) Match Field: X-Key=^((?!QWeqweQWE123).)*$ Any advice will be much appreciate. Thank you