template based parser generator gets major speed boost

[BCS]

I'm planing on adding "!" as a "not" suffix in dparse (if "Blah" can be parsed, 
fail, else continue from the same place) and I'm wondering if anyone would 
find the reverse useful (try to parse a "Foo", if it works, drop it, back 
up to where we started and continue, else fail). Also is there any suggestions 
as to what suffix to use?