First of all, if you standardize for "page" within your entire company, I highly recommend just standardizing to lowercase as well.
Allowing mixed case is just highly error prone.
For that reason the target regexp is off. It also matches "page", which is the opposite of what you want.
The sensible thing to do is to clearly standardize what values "severity" may have, and define the regexp based on that.
For example, if you have three levels (info, ticket, page) the target regexp could simply be "(info|ticket)".
If you really want to allow unbound values for "severity", the target regexp could be "[^(page)]".
This still assumes "page" to always be lowercase.
To your second question:
Your config doesn't show any "continue" set to true.
The "graphite-page" is a sub-route of the previous one. "continue" (if set) only affects following routes on the same level.
If you always want those to go together, just specify a single "graphite" receiver and configure it with email and your paging service combined.