score sender domains with 4+ chars in TLD?

[AJ Weber]

I want to try adding a score for a sender whose address uses a TLD with 
> 3 chars.

I realize there are some legit ones, but I'm going to test it with a low 
score and see what it catches.

Is it just something like:
header   From =~   /\.\w{4,}$/


Thanks in advance.

- AJ