[EXIM] (system) filter regexp don't match multiple lines?

Hello,

Maybe I misinterpreted something but seems the subject is true:

header:
    Received: from blah.example.com [1.2.3.4]
        by mail.example.net by Exim
        ...

rule:

    if $header_Received: matches "from blah.example.com.*by mail.example.net" then
        something....

and the rule doesn't match. should it?

bye,
grin

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