检查邮政编码是否在范围内

Question

this might be a dumb question but I'm new to iOS programming and I just couldn't think of anything. for my app I need to check if a certain postal code is in a range. It's easy to do for German or US codes which are plain numbers, but now I have to do it for canadian.

Example canadian postal code looks like this: A0A, J3X, R7N, V1M.

Is there a way to do this?

Thanks for any help!

Answer 1

You can use a regex like this:

^(A0A|J3X|R7N|V1M)$

If you want ranges you can do something like this:

^(A0A|J3X|R7N|V1[M-Z])$
                 ^--- Will match V1M until V1Z

Another example for range V1Z could be:

^(A0A|J3X|R7N|V[5-9][M-Z])$
                 ^--- Will match VxM until VxZ and V5x until V9x

If you just want a digit you can use \\d (it's the shortcut for [0-9] ). Same for \\w that means [A-Za-z0-9_] .

You can specify ranges using regex classes. Like:

[0-4]
[7-9]
[A-M]
[O-X]

---

This answer on SO has a good description of how regular expression character class ranges work. To paraphrase: you aren't just limited to letters and numbers ( [AZ] or [0-9] ), but you should be careful attempting any more complicated ranges.

A range will allow for any character between, according to the list of ASCII characters , the start and end characters to match. This means any range is technically valid (you may just see odd results). For example, these two classes are the same:

[0-Z]
[0-9:;<=>?@A-Z]