[exim] regex expression to weed out emails sent during certain times of day (12 hour time)

[Pj]

i need help setting up a simple regex expression to catch and filter all 
emails received from 5am to 1am

i am using cPanel Version     11.52.4 (build 0)
Apache Version     2.2.29
Architecture     x86_64
Operating System     linux
can someone help me?
thanks a bunch
pj

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