Ultimate RMT Spam Killer.. Us.
Rather than coding in more and more regex to flag/block RMT spam.. Why not leave it up to the players?
My idea is rather simple and in my opinion, ultimately, fool-proof.
Add the option "Report as RMT" to the right-click menu for incoming /TELL, /SAY and Friend Request names, but limit reports against players to one per person.
Keep a running 'tally' of how many "Report as RMT" clicks a character's account has received in, say, 30 minutes.
If any given player receives more than 5 'Report as RMT' flags in 30 minutes, block the ACCOUNT (not just the character) from being able to send TELLs or Friend Requests for, say, 1 hour for the first offence. The 2nd offence could be 12 hours pending Task Force review.
Personally, I can't really see any flaws in such a system and this also has the added benefit of reducing the workload of the STF, while making it soo much faster and easier to remove RMT spammers from the game.