Note, in case you don't read synopsis checkins: the previous checkin majorly changes the semantics of | within regex to support required longest-token matching semantics rather than left-to-right matching. This is nearly on the same philosophical level as requiring the tail-recursion optimization. It will enable us to write parsers more consistently, and it also opens up normal regexes to better optimization via tries and such. You can now use || for the old | semantics, which is majorly consistent with how | and || work outside of regexen.
Larry
