rule to test "body" length?

Is there a way to check if the body of an email is less than some threshold
(length of chars)? I'm seeing some spam slip through because it's purposely
too short to hit a lot of rules, and too short for DCC and other networked
systems to get a "fingerprint" on.

For example:
Any body where len < 50, score...

Would it be something like /.{1,50}/ ???

Thanks,
-AJ
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