Sadly I think it's gonna be hard to implemment a decent Function list pattern in Regular Expression for EditPlus, since it still uses a very rudimentar version of regexp and it's full of restrictions.
Since SourcePawn doesn't have a keyword for the function prototype as we see in pretty much all other languages, it's gonna be really hard. I had to come up with a regexp that would negate all the control statements (if, for, while etc.). That could be done on Sublime Text 2, but I doubt it will ever be possible on EP. It's still a very good code editor. The seamless browser is very usefull for web applications and it's one of the most customizable editors around. It's a shame the developers didn't update it in such a fashion to stay competitive. :\