Re: iPhone: validate a NSString for US zipcode
Re: iPhone: validate a NSString for US zipcode
- Subject: Re: iPhone: validate a NSString for US zipcode
- From: "Eric E. Dolecki" <email@hidden>
- Date: Thu, 7 Jan 2010 13:07:43 -0500
The webservice reports a city not found error - to which I can default to a
known zipcode instead.
On Thu, Jan 7, 2010 at 12:32 PM, Henry McGilton (Boulevardier) <
email@hidden> wrote:
>
> On Jan 7, 2010, at 8:53 AM, Eric E. Dolecki wrote:
>
> I don't care about the city, just that the zip code will work. On an iPhone
> testing against an array of 42,305 values... could that be pretty quick?
> Seems like a large set to go through looking. I'm sending the value to a
> webservice to return weather data.
>
>
> Time to read about Binary Search --- for a list that size you can find (or
> not) a
> match in just 16 comparisons . . .
>
> Cheers,
> . . . . . . . . Henry
>
>
>
> On Thu, Jan 7, 2010 at 11:45 AM, Paul Bruneau <
> email@hidden
>
> wrote:
>
>
> 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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>
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>
--
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Interactive design and development
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