[cisco-voip] Ughh Route Filters and Route Patterns

[TechGuy]

So I have two sets of PRI's local to two different areas.  Both areas
use 7 digit dialing.

Everything works fine, but since changing telcos recently I am finding
I have to create more and more route patterns to match certain office
codes that do not seem to be local and route them out our long
distance PRI's.

This is becoming messy obviously, and as I understand is part of my we
have route filters to utilize.

The issue is that I am not very familiar with route filters and
accomplishing what I want.

I need a route filter that will match on the area code and office code
and then I guess I create a route pattern that would use that route
filter right and send it out long distance PRI?