[exim] REXEX - Limiting text checking to first part of a mes…

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Lähettäjä: Marc Perkel
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Aihe: [exim] REXEX - Limiting text checking to first part of a message
How would I use a regex = acl conditional so as to limit the scan to a
fixed number of lines or characters at the beginning or end of a
message? Trying to not overtax the system on long messages.