I'm a little unclear what you are asking, but I'll tell what I know.
You just want to know if a 5 digit zip code is a valid one? Or do you
want to compare it to the list of valid city names that are assigned
to it? (yes it can be more than one, ugh)
They are (from a non-USPS point of view) arbitrarily assigned by the
post office and there are currently 42,305 or so assigned (out of a
theoretical maximum of 100,000 of course)
So assuming you just want to know if it's a valid zip (and don't care
about if they got the city right), the only way to validate it solely
from within your app as a valid zip code would be to have a list of
them in your app.
You could load them from a plist or straight text I guess into an
NSArray or NSSet and then check to see if the zip is valid as needed.
You can get the list from a third party service like http://www.zipcodeworld.com/
or maybe from some free source.
The value of this might be questionable, since a zip code with a typo
still has roughly a 50% chance of being a valid one. Plus the USPS is
always adding new ones, so will you risk telling your user that his
zip code doesn't exist when he is standing in it?
So I guess the answer is there is no Cocoa technology that can help
with this--unless you are asking something completely different, in
which case let's all have a good chuckle at my poor comprehension
skills :)
On Jan 7, 2010, at 11:11 AM, Eric E. Dolecki wrote:
I've been googling but haven't seen yet how to best validate a 5-digit
zipcode for use in the US (without using a webservice).
I have the NSString, I just need to validate it. I know zero RegExp,
is
there a formatter I can use?
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