in reply to Re^2: Testing whether a value is in a range.
in thread Testing whether a value is in a range.
Anyway, the UK postal system, alphanumeric and variable as it is, is only one problem. I'm betting that its the most problematic of postcode systems though. The US and Australia have numeric-only systems, and Canada, I believe has a version of the UK system but without the London anomalies (there's SW, and NW, but no NE, just N, that kind of thing).
It may be, however, that the problem is understimating the pinpoint accuracy of the UK system, where a postcode can be as accurate as one half of one side of a street.
In the example of "SW1 <=> SW24" I'm betting that there is no such thing as SW25 or over, so the problem really can be solved as easily as "SW\d+ maps to LHR", without worrying about the numbers.
Other UK postcodes just simply relate to towns. If you have one beginning BN? That's the town of Brighton, and the nearby airport is Gatwick. You wouldn't have to sweat the BN1, BN2 .. BN35 stuff.
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“Every bit of code is either naturally related to the problem at hand, or else it's an accidental side effect of the fact that you happened to solve the problem using a digital computer.”
M-J D
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